# ve!/usr/bin/env pytest
# -*- coding: utf-8 -*-
###############################################################################
# $Id$
#
# Project:  GDAL/OGR Test Suite
# Purpose:  test librarified gdalwarp
# Author:   Faza Mahamood <fazamhd @ gmail dot com>
#
###############################################################################
# Copyright (c) 2015, Faza Mahamood <fazamhd at gmail dot com>
# Copyright (c) 2015, Even Rouault <even.rouault at spatialys.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################

import os
import shutil
import struct

import gdaltest
import ogrtest
import pytest

from osgeo import gdal, ogr, osr

###############################################################################
# Simple test


def test_gdalwarp_lib_1():

    ds1 = gdal.Open("../gcore/data/byte.tif")
    dstDS = gdal.Warp("tmp/testgdalwarp1.tif", ds1)

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    dstDS = None


###############################################################################
# Test -of option


def test_gdalwarp_lib_2():

    ds1 = gdal.Open("../gcore/data/byte.tif")
    dstDS = gdal.Warp(
        "tmp/testgdalwarp2.tif".encode("ascii").decode("ascii"), [ds1], format="GTiff"
    )

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    dstDS = None


###############################################################################
# Test -ot option


def test_gdalwarp_lib_3():

    ds1 = gdal.Open("../gcore/data/byte.tif")
    dstDS = gdal.Warp("", ds1, format="MEM", outputType=gdal.GDT_Int16)

    assert dstDS.GetRasterBand(1).DataType == gdal.GDT_Int16, "Bad data type"

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    dstDS = None


###############################################################################
# Test -t_srs option


def test_gdalwarp_lib_4():

    ds1 = gdal.Open("../gcore/data/byte.tif")
    dstDS = gdal.Warp("", ds1, format="MEM", dstSRS="EPSG:32611")

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    dstDS = None


###############################################################################
# Test warping from GCPs without any explicit option


def test_gdalwarp_lib_5():

    ds = gdal.Open("../gcore/data/byte.tif")
    gcpList = [
        gdal.GCP(440720.000, 3751320.000, 0, 0, 0),
        gdal.GCP(441920.000, 3751320.000, 0, 20, 0),
        gdal.GCP(441920.000, 3750120.000, 0, 20, 20),
        gdal.GCP(440720.000, 3750120.000, 0, 0, 20),
    ]
    ds1 = gdal.Translate(
        "tmp/testgdalwarp_gcp.tif", ds, outputSRS="EPSG:26711", GCPs=gcpList
    )
    dstDS = gdal.Warp("", ds1, format="MEM", tps=True)

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    assert gdaltest.geotransform_equals(
        ds.GetGeoTransform(), dstDS.GetGeoTransform(), 1e-9
    ), "Bad geotransform"

    dstDS = None


###############################################################################
# Test warping from GCPs with -tps


def test_gdalwarp_lib_6():

    ds1 = gdal.Open("tmp/testgdalwarp_gcp.tif")
    dstDS = gdal.Warp("", ds1, format="MEM", tps=True)

    assert dstDS.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    assert gdaltest.geotransform_equals(
        gdal.Open("../gcore/data/byte.tif").GetGeoTransform(),
        dstDS.GetGeoTransform(),
        1e-9,
    ), "Bad geotransform"

    dstDS = None


###############################################################################
# Test -tr


def test_gdalwarp_lib_7():

    ds1 = gdal.Open("tmp/testgdalwarp_gcp.tif")
    dstDS = gdal.Warp("", [ds1], format="MEM", xRes=120, yRes=120)
    assert dstDS is not None

    expected_gt = (440720.0, 120.0, 0.0, 3751320.0, 0.0, -120.0)
    assert gdaltest.geotransform_equals(
        expected_gt, dstDS.GetGeoTransform(), 1e-9
    ), "Bad geotransform"

    dstDS = None


###############################################################################
# Test -ts


def test_gdalwarp_lib_8():

    ds1 = gdal.Open("tmp/testgdalwarp_gcp.tif")
    dstDS = gdal.Warp("", [ds1], format="MEM", width=10, height=10)
    assert dstDS is not None

    expected_gt = (440720.0, 120.0, 0.0, 3751320.0, 0.0, -120.0)
    assert gdaltest.geotransform_equals(
        expected_gt, dstDS.GetGeoTransform(), 1e-9
    ), "Bad geotransform"

    dstDS = None


###############################################################################
# Test -te


def test_gdalwarp_lib_9():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        outputBounds=[440720.000, 3750120.000, 441920.000, 3751320.000],
    )

    assert gdaltest.geotransform_equals(
        gdal.Open("../gcore/data/byte.tif").GetGeoTransform(),
        ds.GetGeoTransform(),
        1e-9,
    ), "Bad geotransform"

    ds = None


###############################################################################
# Test -rn


def test_gdalwarp_lib_10():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        width=40,
        height=40,
        resampleAlg=gdal.GRA_NearestNeighbour,
    )

    assert ds.GetRasterBand(1).Checksum() == 18784, "Bad checksum"

    ds = None


###############################################################################
# Test -rb


def test_gdalwarp_lib_11():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        width=40,
        height=40,
        resampleAlg=gdal.GRA_Bilinear,
    )

    ref_ds = gdal.Open("ref_data/testgdalwarp11.tif")
    maxdiff = gdaltest.compare_ds(ds, ref_ds, verbose=0)

    if maxdiff > 1:
        gdaltest.compare_ds(ds, ref_ds, verbose=1)
        pytest.fail("Image too different from reference")

    ref_ds = None
    ds = None


###############################################################################
# Test -rc


def test_gdalwarp_lib_12():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        width=40,
        height=40,
        resampleAlg=gdal.GRA_Cubic,
    )

    ref_ds = gdal.Open("ref_data/testgdalwarp12.tif")
    maxdiff = gdaltest.compare_ds(ds, ref_ds, verbose=0)

    if maxdiff > 1:
        gdaltest.compare_ds(ds, ref_ds, verbose=1)
        pytest.fail("Image too different from reference")

    ref_ds = None
    ds = None


###############################################################################
# Test -rcs


def test_gdalwarp_lib_13():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        width=40,
        height=40,
        resampleAlg=gdal.GRA_CubicSpline,
    )

    ref_ds = gdal.Open("ref_data/testgdalwarp13.tif")
    maxdiff = gdaltest.compare_ds(ds, ref_ds, verbose=0)

    if maxdiff > 1:
        gdaltest.compare_ds(ds, ref_ds, verbose=1)
        pytest.fail("Image too different from reference")

    ref_ds = None
    ds = None


###############################################################################
# Test -r lanczos


def test_gdalwarp_lib_14():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        width=40,
        height=40,
        resampleAlg=gdal.GRA_Lanczos,
    )

    ref_ds = gdal.Open("ref_data/testgdalwarp14.tif")
    maxdiff = gdaltest.compare_ds(ds, ref_ds, verbose=0)

    if maxdiff > 1:
        gdaltest.compare_ds(ds, ref_ds, verbose=1)
        pytest.fail("Image too different from reference")

    ref_ds = None
    ds = None


###############################################################################
# Test parsing all resampling methods


@pytest.mark.parametrize(
    "resampleAlg,resampleAlgStr",
    [
        (gdal.GRA_NearestNeighbour, "near"),
        (gdal.GRA_Cubic, "cubic"),
        (gdal.GRA_CubicSpline, "cubicspline"),
        (gdal.GRA_Lanczos, "lanczos"),
        (gdal.GRA_Average, "average"),
        (gdal.GRA_RMS, "rms"),
        (gdal.GRA_Mode, "mode"),
        (gdal.GRA_Max, "max"),
        (gdal.GRA_Min, "min"),
        (gdal.GRA_Med, "med"),
        (gdal.GRA_Q1, "q1"),
        (gdal.GRA_Q3, "q3"),
        (gdal.GRA_Sum, "sum"),
    ],
)
def test_gdalwarp_lib_resampling_methods(resampleAlg, resampleAlgStr):

    option_list = gdal.WarpOptions(
        resampleAlg=resampleAlg, options="__RETURN_OPTION_LIST__"
    )
    assert option_list == ["-r", resampleAlgStr]
    assert (
        gdal.Warp(
            "",
            "../gcore/data/byte.tif",
            format="MEM",
            width=2,
            height=2,
            resampleAlg=resampleAlg,
        )
        is not None
    )


###############################################################################
# Test -dstnodata


def test_gdalwarp_lib_15():

    ds = gdal.Warp(
        "", "tmp/testgdalwarp_gcp.tif", format="MEM", dstSRS="EPSG:32610", dstNodata=1
    )

    assert ds.GetRasterBand(1).GetNoDataValue() == 1, "Bad nodata value"

    assert ds.GetRasterBand(1).Checksum() in (4523, 4547)  # 4547 with HPGN grids

    ds = None


###############################################################################
# Test -of VRT which is a special case


def test_gdalwarp_lib_16():

    ds = gdal.Warp(
        "/vsimem/test_gdalwarp_lib_16.vrt", "tmp/testgdalwarp_gcp.tif", format="VRT"
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    ds = None

    gdal.Unlink("/vsimem/test_gdalwarp_lib_16.vrt")

    # Cannot write file
    with pytest.raises(Exception):
        gdal.Warp(
            "/i_dont/exist/test_gdalwarp_lib_16.vrt",
            "tmp/testgdalwarp_gcp.tif",
            format="VRT",
        )


###############################################################################
# Test -dstalpha


def test_gdalwarp_lib_17():

    ds = gdal.Warp("", "../gcore/data/rgbsmall.tif", format="MEM", dstAlpha=True)
    assert ds is not None

    assert ds.GetRasterBand(4) is not None, "No alpha band generated"

    ds = None


###############################################################################
# Test -et 0 which is a special case


def test_gdalwarp_lib_19():

    ds = gdal.Warp("", "tmp/testgdalwarp_gcp.tif", format="MEM", errorThreshold=0)
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    ds = None


###############################################################################
# Test cutline from OGR datasource.


@pytest.mark.require_driver("CSV")
def test_gdalwarp_lib_21():

    ds = gdal.Warp(
        "",
        "../gcore/data/utmsmall.tif",
        format="MEM",
        cutlineDSName="data/cutline.vrt",
        cutlineLayer="cutline",
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 19139, "Bad checksum"

    ds = None


###############################################################################
# Test cutline from PostGIS (mostly to check that we open the dataset in
# vector mode, and not in raster mode, which would cause the PostGISRaster
# driver to be used)


@pytest.mark.require_driver("PostgreSQL")
@pytest.mark.skipif(
    gdal.GetConfigOption("OGR_PG_CONNECTION_STRING", None) is None,
    reason="OGR_PG_CONNECTION_STRING not defined",
)
def test_gdalwarp_lib_cutline_postgis():

    postgis_ds_name = "PG:" + gdal.GetConfigOption("OGR_PG_CONNECTION_STRING", None)
    cutline_ds = ogr.Open(postgis_ds_name, update=1)
    srs = osr.SpatialReference()
    srs.ImportFromEPSG(26711)
    cutline_lyr = cutline_ds.CreateLayer("cutline", srs=srs)
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((400000 3000000,400000 4000000,500000 4000000,500000 3000000,400000 3000000))"
        )
    )
    cutline_lyr.CreateFeature(f)
    cutline_ds = None

    try:
        ds = gdal.Warp(
            "",
            "../gcore/data/byte.tif",
            format="MEM",
            cutlineDSName=postgis_ds_name,
            cutlineSQL="SELECT * FROM cutline",
        )
        assert ds is not None
        assert ds.GetRasterBand(1).Checksum() == 4672
    finally:
        cutline_ds = ogr.Open(postgis_ds_name, update=1)
        cutline_ds.ExecuteSQL("DELLAYER:cutline")


###############################################################################
# Test cutline whose extent is larger than the source data


@pytest.mark.parametrize(
    "options", [{}, {"GDALWARP_SKIP_CUTLINE_CONTAINMENT_TEST": "YES"}]
)
def test_gdalwarp_lib_cutline_larger_source_dataset(options):

    srs = osr.SpatialReference()
    srs.ImportFromEPSG(26711)
    cutline_ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(
        "/vsimem/cutline.shp"
    )
    cutline_lyr = cutline_ds.CreateLayer("cutline", srs=srs)
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((400000 3000000,400000 4000000,500000 4000000,500000 3000000,400000 3000000))"
        )
    )
    cutline_lyr.CreateFeature(f)
    cutline_ds = None

    with gdaltest.config_options(options):
        ds = gdal.Warp(
            "",
            "../gcore/data/byte.tif",
            format="MEM",
            cutlineDSName="/vsimem/cutline.shp",
            cutlineLayer="cutline",
        )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 4672

    ds = None
    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource("/vsimem/cutline.shp")


###############################################################################
# Test cutline with ALL_TOUCHED enabled.


@pytest.mark.require_driver("CSV")
def test_gdalwarp_lib_23():

    ds = gdal.Warp(
        "",
        "../gcore/data/utmsmall.tif",
        format="MEM",
        warpOptions=["CUTLINE_ALL_TOUCHED=TRUE"],
        cutlineDSName="data/cutline.vrt",
        cutlineLayer="cutline",
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 20123, "Bad checksum"

    ds = None


###############################################################################
# Test -tap


def test_gdalwarp_lib_32():

    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        targetAlignedPixels=True,
        xRes=100,
        yRes=50,
    )
    assert ds is not None

    expected_gt = (440700.0, 100.0, 0.0, 3751350.0, 0.0, -50.0)
    got_gt = ds.GetGeoTransform()
    assert gdaltest.geotransform_equals(expected_gt, got_gt, 1e-9), "Bad geotransform"

    assert (
        ds.RasterXSize == 13 and ds.RasterYSize == 25
    ), "Wrong raster dimensions : %d x %d" % (ds.RasterXSize, ds.RasterYSize)

    ds = None


###############################################################################
# Test warping multiple sources


def test_gdalwarp_lib_34():

    srcds1 = gdal.Translate(
        "", "../gcore/data/byte.tif", format="MEM", srcWin=[0, 0, 10, 20]
    )
    srcds2 = gdal.Translate(
        "", "../gcore/data/byte.tif", format="MEM", srcWin=[10, 0, 10, 20]
    )
    ds = gdal.Warp("", [srcds1, srcds2], format="MEM")

    cs = ds.GetRasterBand(1).Checksum()
    gt = ds.GetGeoTransform()
    xsize = ds.RasterXSize
    ysize = ds.RasterYSize
    ds = None

    assert xsize == 20 and ysize == 20, "bad dimensions"

    assert cs == 4672, "bad checksum"

    expected_gt = (440720.0, 60.0, 0.0, 3751320.0, 0.0, -60.0)
    for i in range(6):
        assert gt[i] == pytest.approx(expected_gt[i], abs=1e-5), "bad gt"


###############################################################################
# Test -te_srs


def test_gdalwarp_lib_45():

    ds = gdal.Warp(
        "",
        ["../gcore/data/byte.tif"],
        format="MEM",
        outputBounds=[
            -117.641087629972,
            33.8915301685897,
            -117.628190189534,
            33.9024195619201,
        ],
        outputBoundsSRS="EPSG:4267",
    )
    assert ds.GetRasterBand(1).Checksum() == 4672

    ds = None


###############################################################################
# Test -crop_to_cutline


@pytest.mark.require_driver("CSV")
def test_gdalwarp_lib_46():

    ds = gdal.Warp(
        "",
        ["../gcore/data/utmsmall.tif"],
        format="MEM",
        cutlineDSName="data/cutline.vrt",
        cropToCutline=True,
    )
    assert ds.GetRasterBand(1).Checksum() == 18837, "Bad checksum"

    ds = None

    # Precisely test output raster bounds in no raster reprojection ccase

    src_ds = gdal.Translate(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        outputBounds=[2, 49, 3, 48],
        outputSRS="EPSG:4326",
    )

    cutlineDSName = "/vsimem/test_gdalwarp_lib_46.json"
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    cutline_lyr = cutline_ds.CreateLayer("cutline")
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((2.13 48.13,2.83 48.13,2.83 48.83,2.13 48.83,2.13 48.13))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    # No CUTLINE_ALL_TOUCHED: the extent should be smaller than the cutline
    ds = gdal.Warp(
        "", src_ds, format="MEM", cutlineDSName=cutlineDSName, cropToCutline=True
    )
    got_gt = ds.GetGeoTransform()
    expected_gt = (2.15, 0.05, 0.0, 48.8, 0.0, -0.05)
    assert max([abs(got_gt[i] - expected_gt[i]) for i in range(6)]) <= 1e-8
    assert ds.RasterXSize == 13 and ds.RasterYSize == 13

    # Same but with CUTLINE_ALL_TOUCHED=YES: the extent should be larger
    # than the cutline
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        cutlineDSName=cutlineDSName,
        cropToCutline=True,
        warpOptions=["CUTLINE_ALL_TOUCHED=YES"],
    )
    got_gt = ds.GetGeoTransform()
    expected_gt = (2.1, 0.05, 0.0, 48.85, 0.0, -0.05)
    assert max([abs(got_gt[i] - expected_gt[i]) for i in range(6)]) <= 1e-8
    assert ds.RasterXSize == 15 and ds.RasterYSize == 15

    # Test numeric stability when the cutline is exactly on pixel boundaries
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    cutline_lyr = cutline_ds.CreateLayer("cutline")
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((2.15 48.15,2.85 48.15,2.85 48.85,2.15 48.85,2.15 48.15))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    for warpOptions in [[], ["CUTLINE_ALL_TOUCHED=YES"]]:
        ds = gdal.Warp(
            "",
            src_ds,
            format="MEM",
            cutlineDSName=cutlineDSName,
            cropToCutline=True,
            warpOptions=warpOptions,
        )
        got_gt = ds.GetGeoTransform()
        expected_gt = (2.15, 0.05, 0.0, 48.85, 0.0, -0.05)
        assert max([abs(got_gt[i] - expected_gt[i]) for i in range(6)]) <= 1e-8
        assert ds.RasterXSize == 14 and ds.RasterYSize == 14

    gdal.Unlink(cutlineDSName)


###############################################################################
# Test -crop_to_cutline -tr X Y -wo CUTLINE_ALL_TOUCHED=YES (fixes for #1360)


def test_gdalwarp_lib_cutline_all_touched_single_pixel():

    cutlineDSName = "/vsimem/test_gdalwarp_lib_cutline_all_touched_single_pixel.json"
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    cutline_lyr = cutline_ds.CreateLayer("cutline")
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((2.15 48.15,2.15000001 48.15000001,2.15 48.15000001,2.15 48.15))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    src_ds = gdal.Translate(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        outputBounds=[2, 49, 3, 48],
        outputSRS="EPSG:4326",
    )

    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        cutlineDSName=cutlineDSName,
        cropToCutline=True,
        warpOptions=["CUTLINE_ALL_TOUCHED=YES"],
        xRes=0.001,
        yRes=0.001,
    )
    got_gt = ds.GetGeoTransform()
    expected_gt = (2.15, 0.001, 0.0, 48.151, 0.0, -0.001)
    assert max([abs(got_gt[i] - expected_gt[i]) for i in range(6)]) <= 1e-8, got_gt
    assert ds.RasterXSize == 1 and ds.RasterYSize == 1

    gdal.Unlink(cutlineDSName)


###############################################################################
# Test -crop_to_cutline where the geometry is very close to pixel boundaries
# (#7226)s


@pytest.mark.require_driver("CSV")
def test_gdalwarp_lib_crop_to_cutline_slightly_shifted_wrt_pixel_boundaries():

    cutlineDSName = (
        "/vsimem/test_gdalwarp_lib_crop_to_cutline_close_to_pixel_boundaries.json"
    )
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    srs = osr.SpatialReference()
    srs.ImportFromEPSG(26711)
    cutline_lyr = cutline_ds.CreateLayer("cutline", srs=srs)
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON((440720.001 3751320.001,440720.001 3750120.001,441920.001 3750120.001,441920.001 3751320.001,440720.001 3751320.001))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    src_ds = gdal.Open("../gcore/data/byte.tif")
    ds = gdal.Warp(
        "", src_ds, format="MEM", cutlineDSName=cutlineDSName, cropToCutline=True
    )
    assert ds.RasterXSize == src_ds.RasterXSize
    assert ds.RasterYSize == src_ds.RasterYSize
    assert ds.GetGeoTransform() == src_ds.GetGeoTransform()
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(1).Checksum()

    src_ds = gdal.Open("../gcore/data/byte.tif")
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        cutlineDSName=cutlineDSName,
        cropToCutline=True,
        warpOptions=["CUTLINE_ALL_TOUCHED=YES"],
    )
    assert ds.RasterXSize == src_ds.RasterXSize
    assert ds.RasterYSize == src_ds.RasterYSize
    assert ds.GetGeoTransform() == src_ds.GetGeoTransform()
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(1).Checksum()

    gdal.Unlink(cutlineDSName)


###############################################################################
# Test callback


def mycallback(pct, msg, user_data):
    # pylint: disable=unused-argument
    user_data[0] = pct
    return 1


def test_gdalwarp_lib_100():

    tab = [0]
    ds = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        format="MEM",
        callback=mycallback,
        callback_data=tab,
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"

    assert tab[0] == 1.0, "Bad percentage"

    ds = None


###############################################################################
# Test with color table


def test_gdalwarp_lib_101():

    ds = gdal.Warp("", "../gdrivers/data/small_world_pct.tif", format="MEM")
    assert ds.GetRasterBand(1).GetColorTable() is not None, "Did not get color table"


###############################################################################
# Test with a dataset with no bands


def test_gdalwarp_lib_102():

    no_band_ds = gdal.GetDriverByName("MEM").Create("no band", 1, 1, 0)
    with pytest.raises(Exception):
        gdal.Warp(
            "", ["../gdrivers/data/small_world_pct.tif", no_band_ds], format="MEM"
        )


###############################################################################
# Test failed transformer


def test_gdalwarp_lib_103():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            [
                "../gdrivers/data/small_world_pct.tif",
                "../gcore/data/stefan_full_rgba.tif",
            ],
            format="MEM",
        )


###############################################################################
# Test no usable source image


def test_gdalwarp_lib_104():

    with pytest.raises(Exception):
        gdal.Warp("", [], format="MEM")


###############################################################################
# Used to be a failure in GDALSuggestedWarpOutput2 with proj 4.9.3


def test_gdalwarp_lib_105():

    gdal.Warp(
        "",
        ["../gdrivers/data/small_world_pct.tif", "../gcore/data/byte.tif"],
        format="MEM",
        dstSRS="EPSG:32645",
        width=100,
        height=100,
    )


###############################################################################
# Test failure in creation


def test_gdalwarp_lib_106():

    with pytest.raises(Exception):
        gdal.Warp(
            "/not_existing_dir/not_existing_file",
            ["../gdrivers/data/small_world_pct.tif", "../gcore/data/byte.tif"],
        )


###############################################################################
# Test forced width only


def test_gdalwarp_lib_107():

    ds = gdal.Warp("", "../gcore/data/byte.tif", format="MEM", width=20)
    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"


###############################################################################
# Test forced height only


def test_gdalwarp_lib_108():

    ds = gdal.Warp("", "../gcore/data/byte.tif", format="MEM", height=20)
    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"


###############################################################################
# Test wrong cutline name


def test_gdalwarp_lib_109():

    with pytest.raises(Exception):
        gdal.Warp(
            "", "../gcore/data/byte.tif", format="MEM", cutlineDSName="/does/not/exist"
        )


###############################################################################
# Test wrong cutline layer name


def test_gdalwarp_lib_110():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/byte.tif",
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="wrong_name",
        )


###############################################################################
# Test cutline SQL


@pytest.mark.require_driver("CSV")
def test_gdalwarp_lib_111():

    ds = gdal.Warp(
        "",
        "../gcore/data/utmsmall.tif",
        format="MEM",
        cutlineDSName="data/cutline.vrt",
        cutlineSQL="SELECT * FROM cutline",
        cutlineWhere="1 = 1",
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 19139, "Bad checksum"

    ds = None


###############################################################################
# Test cutline without geometry


def test_gdalwarp_lib_112():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource("/vsimem/cutline.shp")
    lyr = ds.CreateLayer("cutline")
    f = ogr.Feature(lyr.GetLayerDefn())
    lyr.CreateFeature(f)
    f = None
    ds = None
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="/vsimem/cutline.shp",
            cutlineSQL="SELECT * FROM cutline",
        )
    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource("/vsimem/cutline.shp")


###############################################################################
# Test cutline with non polygon geometry


def test_gdalwarp_lib_113():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource("/vsimem/cutline.shp")
    lyr = ds.CreateLayer("cutline")
    f = ogr.Feature(lyr.GetLayerDefn())
    f.SetGeometry(ogr.CreateGeometryFromWkt("POINT(0 0)"))
    lyr.CreateFeature(f)
    f = None
    ds = None
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="/vsimem/cutline.shp",
        )
    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource("/vsimem/cutline.shp")


###############################################################################
# Test cutline without feature


def test_gdalwarp_lib_114():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource("/vsimem/cutline.shp")
    ds.CreateLayer("cutline")
    ds = None
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="/vsimem/cutline.shp",
        )
    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource("/vsimem/cutline.shp")


###############################################################################
# Test source dataset without band


def test_gdalwarp_lib_115():

    no_band_ds = gdal.GetDriverByName("MEM").Create("no band", 1, 1, 0)
    out_ds = gdal.GetDriverByName("MEM").Create("", 1, 1, 0)

    with pytest.raises(Exception):
        gdal.Warp(
            out_ds, no_band_ds, cutlineDSName="data/cutline.vrt", cutlineLayer="cutline"
        )


###############################################################################
# Test failed cropToCutline due to invalid SRC_SRS


def test_gdalwarp_lib_116():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="cutline",
            cropToCutline=True,
            transformerOptions=["SRC_SRS=invalid"],
        )


###############################################################################
# Test failed cropToCutline due to invalid DST_SRS


def test_gdalwarp_lib_117():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="cutline",
            cropToCutline=True,
            transformerOptions=["DST_SRS=invalid"],
        )


###############################################################################
# Test failed cropToCutline due to no source raster


def test_gdalwarp_lib_118():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            [],
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="cutline",
            cropToCutline=True,
        )


###############################################################################
# Test failed cropToCutline due to source raster without projection


def test_gdalwarp_lib_119():

    no_proj_ds = gdal.GetDriverByName("MEM").Create("no_proj_ds", 1, 1)
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            no_proj_ds,
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="cutline",
            cropToCutline=True,
        )


###############################################################################
# Test failed cropToCutline due to source raster with dummy projection


def test_gdalwarp_lib_120():

    dummy_proj_ds = gdal.GetDriverByName("MEM").Create("no_proj_ds", 1, 1)
    dummy_proj_ds.SetProjection("dummy")
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            dummy_proj_ds,
            format="MEM",
            cutlineDSName="data/cutline.vrt",
            cutlineLayer="cutline",
            cropToCutline=True,
        )


###############################################################################
# Test internal wrappers


def test_gdalwarp_lib_121():

    # No option
    with pytest.raises(Exception):
        gdal.wrapper_GDALWarpDestName("", [], None)

    # Will create an implicit options structure
    with pytest.raises(Exception):
        gdal.wrapper_GDALWarpDestName("", [], None, gdal.TermProgress_nocb)

    # Null dest name
    with gdaltest.error_handler():
        with pytest.raises(Exception):
            gdal.wrapper_GDALWarpDestName(None, [], None)

    # No option
    gdal.wrapper_GDALWarpDestDS(gdal.GetDriverByName("MEM").Create("", 1, 1), [], None)

    # Will create an implicit options structure
    gdal.wrapper_GDALWarpDestDS(
        gdal.GetDriverByName("MEM").Create("", 1, 1),
        [],
        None,
        gdal.TermProgress_nocb,
    )


###############################################################################
# Test unnamed output VRT


def test_gdalwarp_lib_122():

    ds = gdal.Warp("", "../gcore/data/byte.tif", format="VRT")
    assert ds.GetRasterBand(1).Checksum() == 4672, "Bad checksum"


###############################################################################
# Test failure during warping


def test_gdalwarp_lib_123():

    with pytest.raises(Exception):
        gdal.Warp("", "../gcore/data/byte_truncated.tif", format="MEM")


###############################################################################
# Test warping to dataset with existing nodata


def test_gdalwarp_lib_124():

    src_ds = gdal.GetDriverByName("MEM").Create("", 2, 2)
    src_ds.SetGeoTransform([10, 1, 0, 10, 0, -1])
    src_ds.GetRasterBand(1).SetNoDataValue(12)
    src_ds.GetRasterBand(1).Fill(12)

    out_ds = gdal.GetDriverByName("MEM").Create("", 2, 2)
    out_ds.SetGeoTransform([10, 1, 0, 10, 0, -1])
    out_ds.GetRasterBand(1).SetNoDataValue(21)
    out_ds.GetRasterBand(1).Fill(21)
    expected_cs = out_ds.GetRasterBand(1).Checksum()

    gdal.Warp(out_ds, src_ds)

    cs = out_ds.GetRasterBand(1).Checksum()
    assert cs == expected_cs, "Bad checksum"


###############################################################################
# Test that statistics are not propagated


def test_gdalwarp_lib_125():

    for i in range(3):

        src_ds_1 = gdal.GetDriverByName("MEM").Create("", 2, 2)
        src_ds_1.SetGeoTransform([10, 1, 0, 10, 0, -1])
        if i == 1 or i == 3:
            src_ds_1.GetRasterBand(1).SetMetadataItem("STATISTICS_MINIMUM", "5")

        src_ds_2 = gdal.GetDriverByName("MEM").Create("", 2, 2)
        src_ds_2.SetGeoTransform([10, 1, 0, 10, 0, -1])
        if i == 2 or i == 3:
            src_ds_2.GetRasterBand(1).SetMetadataItem("STATISTICS_MINIMUM", "5")

        out_ds = gdal.Warp("", [src_ds_1, src_ds_2], format="MEM")

        assert out_ds.GetRasterBand(1).GetMetadataItem("STATISTICS_MINIMUM") is None, i


###############################################################################
# Test cutline with invalid geometry


@pytest.mark.require_geos
def test_gdalwarp_lib_126():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource("/vsimem/cutline.shp")
    lyr = ds.CreateLayer("cutline")
    f = ogr.Feature(lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt("POLYGON((0 0,1 1,0 1,1 0,0 0))")
    )  # Self intersecting
    lyr.CreateFeature(f)
    f = None
    ds = None
    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            cutlineDSName="/vsimem/cutline.shp",
        )
    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource("/vsimem/cutline.shp")


###############################################################################
# Test -srcnodata (#6315)


def test_gdalwarp_lib_127():

    ds = gdal.Warp("", "../gcore/data/byte.tif", format="MEM", srcNodata=1)
    assert ds.GetRasterBand(1).GetNoDataValue() == 1, "bad nodata value"
    assert ds.GetRasterBand(1).Checksum() == 4672, "bad checksum"


###############################################################################
# Test automatic densification of cutline (#6375)


def test_gdalwarp_lib_128():

    mem_ds = gdal.GetDriverByName("MEM").Create("", 1177, 4719)
    rpc = [
        "HEIGHT_OFF=109",
        "LINE_NUM_COEFF=-0.001245683 -0.09427649 -1.006342 -1.954469e-05 0.001033926 2.020534e-08 -3.845472e-07 -0.002075817 0.0005520694 0 -4.642442e-06 -3.271793e-06 2.705977e-05 -7.634384e-07 -2.132832e-05 -3.248862e-05 -8.17894e-06 -3.678094e-07 2.002032e-06 3.693162e-08",
        "LONG_OFF=7.1477",
        "SAMP_DEN_COEFF=1 0.01415176 -0.003715018 -0.001205632 -0.0007738299 4.057763e-05 -1.649126e-05 0.0001453584 0.0001628194 -7.354731e-05 4.821444e-07 -4.927701e-06 -1.942371e-05 -2.817499e-06 1.946396e-06 3.04243e-06 2.362282e-07 -2.5371e-07 -1.36993e-07 1.132432e-07",
        "LINE_SCALE=2360",
        "SAMP_NUM_COEFF=0.04337163 1.775948 -0.87108 0.007425391 0.01783631 0.0004057179 -0.000184695 -0.04257537 -0.01127869 -1.531228e-06 1.017961e-05 0.000572344 -0.0002941 -0.0001301705 -0.0003289546 5.394918e-05 6.388447e-05 -4.038289e-06 -7.525785e-06 -5.431241e-07",
        "LONG_SCALE=0.8383",
        "SAMP_SCALE=593",
        "SAMP_OFF=589",
        "LAT_SCALE=1.4127",
        "LAT_OFF=33.8992",
        "LINE_OFF=2359",
        "LINE_DEN_COEFF=1 0.0007273139 -0.0006006867 -4.272095e-07 2.578717e-05 4.718479e-06 -2.116976e-06 -1.347805e-05 -2.209958e-05 8.131258e-06 -7.290143e-08 5.105109e-08 -7.353388e-07 0 2.131142e-06 9.697701e-08 1.237039e-08 7.153246e-08 6.758015e-08 5.811124e-08",
        "HEIGHT_SCALE=96.3",
    ]
    mem_ds.SetMetadata(rpc, "RPC")
    mem_ds.GetRasterBand(1).Fill(255)

    cutlineDSName = "/vsimem/test_gdalwarp_lib_128.json"
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    cutline_lyr = cutline_ds.CreateLayer("cutline")
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON ((7.2151 32.51930,7.214316 32.58116,7.216043 32.59476,7.21666 32.5193,7.2151 32.51930))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    # Default is GDALWARP_DENSIFY_CUTLINE=YES
    ds = gdal.Warp(
        "",
        mem_ds,
        format="MEM",
        cutlineDSName=cutlineDSName,
        dstSRS="EPSG:4326",
        outputBounds=[7.2, 32.52, 7.217, 32.59],
        xRes=0.000226555,
        yRes=0.000226555,
        transformerOptions=["RPC_DEM=data/test_gdalwarp_lib_128_dem.tif"],
    )
    cs = ds.GetRasterBand(1).Checksum()

    assert cs == 4248, "bad checksum"

    # Below steps depend on GEOS
    if not ogrtest.have_geos():
        gdal.Unlink(cutlineDSName)
        return

    with gdal.config_option("GDALWARP_DENSIFY_CUTLINE", "ONLY_IF_INVALID"):
        ds = gdal.Warp(
            "",
            mem_ds,
            format="MEM",
            cutlineDSName=cutlineDSName,
            dstSRS="EPSG:4326",
            outputBounds=[7.2, 32.52, 7.217, 32.59],
            xRes=0.000226555,
            yRes=0.000226555,
            transformerOptions=["RPC_DEM=data/test_gdalwarp_lib_128_dem.tif"],
        )
    cs = ds.GetRasterBand(1).Checksum()

    assert cs == 4248, "bad checksum"

    with gdal.config_option("GDALWARP_DENSIFY_CUTLINE", "NO"), pytest.raises(Exception):
        gdal.Warp(
            "",
            mem_ds,
            format="MEM",
            cutlineDSName=cutlineDSName,
            dstSRS="EPSG:4326",
            outputBounds=[7.2, 32.52, 7.217, 32.59],
            xRes=0.000226555,
            yRes=0.000226555,
            transformerOptions=["RPC_DEM=data/test_gdalwarp_lib_128_dem.tif"],
        )

    gdal.Unlink(cutlineDSName)


###############################################################################
# Test automatic densification of cutline, but with initial guess leading
# to an invalid geometry (#6375)


@pytest.mark.require_geos
def test_gdalwarp_lib_129():

    mem_ds = gdal.GetDriverByName("MEM").Create("", 1000, 2000)
    rpc = [
        "HEIGHT_OFF=1767",
        "LINE_NUM_COEFF=0.0004430579 -0.06200816 -1.007087 1.614683e-05 0.0009263463 -1.003745e-07 -2.346893e-06 -0.001179024 -0.0007413534 0 9.41488e-08 -4.566652e-07 2.895947e-05 -2.925327e-07 -2.308839e-05 -1.502702e-05 -4.775127e-06 0 4.290483e-07 2.850458e-08",
        "LONG_OFF=-.2282",
        "SAMP_DEN_COEFF=1 -0.01907542 0.01651069 -0.001340671 -0.0005495095 -1.072863e-05 -1.157626e-05 0.0003737224 0.0002712591 -0.0001363199 3.614417e-08 3.584749e-06 9.175671e-06 2.661593e-06 -1.045511e-05 -1.293648e-06 -2.769964e-06 5.931109e-07 -1.018687e-07 2.366109e-07",
        "LINE_SCALE=11886",
        "SAMP_NUM_COEFF=0.007334337 1.737166 -0.7954719 -0.004635387 -0.007478255 0.0006381186 -0.0003313475 0.0002313095 -0.002883101 -1.625925e-06 -6.409095e-06 -0.000403506 -0.0004441055 -0.0002360882 8.940442e-06 -0.0001780485 0.0001081517 -6.592931e-06 2.642496e-06 6.316508e-07",
        "LONG_SCALE=0.6996",
        "SAMP_SCALE=2945",
        "SAMP_OFF=2926",
        "LAT_SCALE=1.4116",
        "LAT_OFF=.4344",
        "LINE_OFF=-115",
        "LINE_DEN_COEFF=1 0.0008882352 -0.0002437686 -2.380782e-06 2.69128e-05 0 2.144654e-07 -2.093549e-05 -7.055149e-06 4.740057e-06 0 -1.588607e-08 -1.397592e-05 0 -7.717698e-07 6.505002e-06 0 -1.225041e-08 3.608499e-08 -4.463376e-08",
        "HEIGHT_SCALE=1024",
    ]

    mem_ds.SetMetadata(rpc, "RPC")
    mem_ds.GetRasterBand(1).Fill(255)

    cutlineDSName = "/vsimem/test_gdalwarp_lib_129.json"
    cutline_ds = ogr.GetDriverByName("GeoJSON").CreateDataSource(cutlineDSName)
    cutline_lyr = cutline_ds.CreateLayer("cutline")
    f = ogr.Feature(cutline_lyr.GetLayerDefn())
    f.SetGeometry(
        ogr.CreateGeometryFromWkt(
            "POLYGON ((-0.873086 0.511332,-0.626502 0.507654,-0.630715 0.282053,-0.876863 0.285693,-0.873086 0.511332))"
        )
    )
    cutline_lyr.CreateFeature(f)
    f = None
    cutline_lyr = None
    cutline_ds = None

    ds = gdal.Warp(
        "",
        mem_ds,
        format="MEM",
        cutlineDSName=cutlineDSName,
        dstSRS="EPSG:4326",
        outputBounds=[-1, 0, 0, 1],
        xRes=0.01,
        yRes=0.01,
        transformerOptions=["RPC_DEM=data/test_gdalwarp_lib_129_dem.vrt"],
    )
    cs = ds.GetRasterBand(1).Checksum()

    assert cs == 399, "bad checksum"

    gdal.Unlink(cutlineDSName)


###############################################################################
# Test automatic detection and setting of alpha channel, and setting RGB on
# GTiff output


def test_gdalwarp_lib_130():

    src_ds = gdal.GetDriverByName("GTiff").Create(
        "/vsimem/test_gdalwarp_lib_130.tif", 1, 1, 5, options=["PHOTOMETRIC=RGB"]
    )
    src_ds.SetGeoTransform([100, 1, 0, 200, 0, -1])
    src_ds.GetRasterBand(5).SetColorInterpretation(gdal.GCI_AlphaBand)
    src_ds.GetRasterBand(1).Fill(1)
    src_ds.GetRasterBand(2).Fill(2)
    src_ds.GetRasterBand(3).Fill(3)
    src_ds.GetRasterBand(4).Fill(4)
    src_ds.GetRasterBand(5).Fill(255)

    ds = gdal.Warp("/vsimem/test_gdalwarp_lib_130_dst.tif", src_ds)
    assert (
        ds.GetRasterBand(1).GetColorInterpretation() == gdal.GCI_RedBand
    ), "bad color interpretation"
    assert (
        ds.GetRasterBand(5).GetColorInterpretation() == gdal.GCI_AlphaBand
    ), "bad color interpretation"
    expected_val = [1, 2, 3, 4, 255]
    for i in range(5):
        data = struct.unpack("B" * 1, ds.GetRasterBand(i + 1).ReadRaster())[0]
        assert data == expected_val[i], "bad checksum"

    # Wrap onto existing file
    for i in range(5):
        ds.GetRasterBand(i + 1).Fill(0)
    gdal.Warp(ds, src_ds)
    for i in range(5):
        data = struct.unpack("B" * 1, ds.GetRasterBand(i + 1).ReadRaster())[0]
        assert data == expected_val[i], "bad checksum"

    src_ds = None
    ds = None

    assert (
        gdal.VSIStatL("/vsimem/test_gdalwarp_lib_130_dst.tif.aux.xml") is None
    ), "got PAM file"

    gdal.Unlink("/vsimem/test_gdalwarp_lib_130.tif")
    gdal.Unlink("/vsimem/test_gdalwarp_lib_130_dst.tif")


###############################################################################
# Test -nosrcalpha


def test_gdalwarp_lib_131():

    src_ds = gdal.GetDriverByName("GTiff").Create(
        "/vsimem/test_gdalwarp_lib_131.tif", 1, 1, 2
    )
    src_ds.SetGeoTransform([100, 1, 0, 200, 0, -1])
    src_ds.GetRasterBand(2).SetColorInterpretation(gdal.GCI_AlphaBand)
    src_ds.GetRasterBand(1).Fill(1)
    src_ds.GetRasterBand(2).Fill(0)

    ds = gdal.Warp(
        "/vsimem/test_gdalwarp_lib_131_dst.tif", src_ds, options="-nosrcalpha"
    )
    expected_val = [1, 0]
    for i in range(2):
        data = struct.unpack("B" * 1, ds.GetRasterBand(i + 1).ReadRaster())[0]
        assert data == expected_val[i], "bad checksum"
    src_ds = None
    ds = None
    gdal.Unlink("/vsimem/test_gdalwarp_lib_131.tif")
    gdal.Unlink("/vsimem/test_gdalwarp_lib_131_dst.tif")
    if gdal.VSIStatL("/vsimem/test_gdalwarp_lib_131_dst.tif.aux.xml") is not None:
        gdal.Unlink("/vsimem/test_gdalwarp_lib_131_dst.tif.aux.xml")


###############################################################################
# Test that alpha blending works by warping onto an existing dataset
# with alpha > 0 and < 255


def test_gdalwarp_lib_132():

    for dt in [gdal.GDT_Byte, gdal.GDT_Float32]:
        src_ds = gdal.GetDriverByName("GTiff").Create(
            "/vsimem/test_gdalwarp_lib_132.tif", 33, 1, 2, dt
        )
        src_ds.SetGeoTransform([100, 1, 0, 200, 0, -1])
        src_ds.GetRasterBand(2).SetColorInterpretation(gdal.GCI_AlphaBand)

        ds = gdal.Translate("/vsimem/test_gdalwarp_lib_132_dst.tif", src_ds)
        dst_grey = 60
        dst_alpha = 100
        ds.GetRasterBand(1).Fill(dst_grey)
        ds.GetRasterBand(2).Fill(dst_alpha)

        src_grey = 170
        src_alpha = 200
        src_ds.GetRasterBand(1).Fill(src_grey)
        src_ds.GetRasterBand(2).Fill(src_alpha)
        gdal.Warp(ds, src_ds)
        expected_alpha = int(src_alpha + dst_alpha * (255 - src_alpha) / 255.0 + 0.5)
        expected_grey = int(
            (src_grey * src_alpha + dst_grey * dst_alpha * (255 - src_alpha) / 255.0)
            / expected_alpha
            + 0.5
        )
        expected_val = [expected_grey, expected_alpha]
        for i in range(2):
            for x in range(33):
                data = struct.unpack(
                    "B" * 1,
                    ds.GetRasterBand(i + 1).ReadRaster(
                        i, 0, 1, 1, buf_type=gdal.GDT_Byte
                    ),
                )[0]
                if data != pytest.approx(expected_val[i], abs=1):
                    print(dt)
                    print(x)
                    pytest.fail("bad checksum")
        ds = None

        src_ds = None

        gdal.Unlink("/vsimem/test_gdalwarp_lib_132.tif")
        gdal.Unlink("/vsimem/test_gdalwarp_lib_132_dst.tif")
        if gdal.VSIStatL("/vsimem/test_gdalwarp_lib_132_dst.tif.aux.xml") is not None:
            gdal.Unlink("/vsimem/test_gdalwarp_lib_132_dst.tif.aux.xml")


###############################################################################
# Test cutline with multiple touching polygons


def test_gdalwarp_lib_133():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(
        "/vsimem/test_gdalwarp_lib_133.shp"
    )
    lyr = ds.CreateLayer("cutline")
    f = ogr.Feature(lyr.GetLayerDefn())
    f.SetGeometry(ogr.CreateGeometryFromWkt("POLYGON((0 0,1 0,1 1,0 1,0 0))"))
    lyr.CreateFeature(f)
    f = ogr.Feature(lyr.GetLayerDefn())
    f.SetGeometry(ogr.CreateGeometryFromWkt("POLYGON((1 0,2 0,2 1,1 1,1 0))"))
    lyr.CreateFeature(f)
    f = None
    ds = None

    src_ds = gdal.GetDriverByName("MEM").Create("", 4, 1)
    src_ds.SetGeoTransform([0, 1, 0, 1, 0, -1])
    src_ds.GetRasterBand(1).Fill(255)
    ds = gdal.Warp(
        "", src_ds, format="MEM", cutlineDSName="/vsimem/test_gdalwarp_lib_133.shp"
    )
    assert ds is not None

    assert ds.GetRasterBand(1).Checksum() == 5, "Bad checksum"

    ds = None

    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource(
        "/vsimem/test_gdalwarp_lib_133.shp"
    )


###############################################################################
# Test SRC_METHOD=NO_GEOTRANSFORM and DST_METHOD=NO_GEOTRANSFORM (#6721)


def test_gdalwarp_lib_134():

    ds = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(
        "/vsimem/test_gdalwarp_lib_134.shp"
    )
    lyr = ds.CreateLayer("cutline")
    f = ogr.Feature(lyr.GetLayerDefn())
    f.SetGeometry(ogr.CreateGeometryFromWkt("POLYGON((2 2,2 18,18 18,18 2,2 2))"))
    lyr.CreateFeature(f)
    f = None
    ds = None

    src_src_ds = gdal.Open("../gcore/data/byte.tif")
    src_ds = gdal.GetDriverByName("MEM").Create("", 20, 20)
    src_ds.GetRasterBand(1).WriteRaster(
        0, 0, 20, 20, src_src_ds.GetRasterBand(1).ReadRaster()
    )
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM", "DST_METHOD=NO_GEOTRANSFORM"],
        outputBounds=[1, 2, 4, 6],
    )
    assert ds is not None

    assert ds.GetRasterBand(1).ReadRaster() == src_src_ds.GetRasterBand(1).ReadRaster(
        1, 2, 4 - 1, 6 - 2
    ), "Bad checksum"

    ds = None

    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM", "DST_METHOD=NO_GEOTRANSFORM"],
        cutlineDSName="/vsimem/test_gdalwarp_lib_134.shp",
        cropToCutline=True,
    )
    assert ds is not None

    assert ds.GetRasterBand(1).ReadRaster() == src_src_ds.GetRasterBand(1).ReadRaster(
        2, 2, 16, 16
    ), "Bad checksum"

    ds = None

    ogr.GetDriverByName("ESRI Shapefile").DeleteDataSource(
        "/vsimem/test_gdalwarp_lib_134.shp"
    )


###############################################################################
# Test vertical datum shift


@pytest.mark.require_driver("GTX")
def test_gdalwarp_lib_135():

    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    src_ds.GetRasterBand(1).Fill(100)

    sr = osr.SpatialReference()
    sr.SetFromUserInput("WGS84")

    src_ds_longlat = gdal.GetDriverByName("MEM").Create("", 2, 1)
    src_ds_longlat.SetProjection(sr.ExportToWkt())
    src_ds_longlat.SetGeoTransform([-180, 180, 0, 90, 0, -180])
    src_ds_longlat.GetRasterBand(1).Fill(100)

    grid_ds = gdal.GetDriverByName("GTX").Create(
        "tmp/grid.gtx", 3, 3, 1, gdal.GDT_Float32
    )
    grid_ds.SetProjection(sr.ExportToWkt())
    grid_ds.SetGeoTransform([-180 - 90, 180, 0, 90 + 45, 0, -90])
    grid_ds.GetRasterBand(1).Fill(20)
    grid_ds = None

    grid_ds = gdal.GetDriverByName("GTX").Create(
        "tmp/grid2.gtx", 3, 3, 1, gdal.GDT_Float32
    )
    grid_ds.SetProjection(sr.ExportToWkt())
    grid_ds.SetGeoTransform([-180 - 90, 180, 0, 90 + 45, 0, -90])
    grid_ds.GetRasterBand(1).Fill(5)
    grid_ds = None

    # Forward transform
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
        dstSRS="EPSG:4979",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    ds = gdal.Warp(
        "",
        src_ds_longlat,
        format="MEM",
        srcSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
        dstSRS="EPSG:4979",
    )
    assert ds.GetGeoTransform() == (-180, 180, 0, 90, 0, -180)
    data = struct.unpack("B" * 2, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    # Inverse transform
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +no_defs",
        dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 80, "Bad value"

    ds = gdal.Warp(
        "",
        src_ds_longlat,
        format="MEM",
        srcSRS="EPSG:4979",
        dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
    )
    assert ds.GetGeoTransform() == (-180, 180, 0, 90, 0, -180)
    data = struct.unpack("B" * 2, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 80, "Bad value"

    # Both transforms
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
        dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid2.gtx +vunits=m +no_defs",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 115, "Bad value"

    # Both transforms, but none of them have geoidgrids
    ds = gdal.Warp(
        "", src_ds, format="MEM", srcSRS="EPSG:32631+5730", dstSRS="EPSG:4326+5621"
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    # Both transforms being a no-op
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
        dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    if (osr.GetPROJVersionMajor(), osr.GetPROJVersionMinor()) >= (6, 3):
        # Both transforms to anonymous VRT
        ds = gdal.Warp(
            "",
            src_ds,
            format="VRT",
            srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
            dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid2.gtx +vunits=m +no_defs",
        )
        src_ds = None  # drop the ref to src_ds before for fun
        data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
        assert data == 115, "Bad value"

        src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
        src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
        src_ds.GetRasterBand(1).Fill(100)

        # Target CRS in us-ft
        ds = gdal.Warp(
            "",
            src_ds,
            format="VRT",
            outputType=gdal.GDT_Float32,
            srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
            dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid2.gtx +vunits=us-ft +no_defs",
        )
        data = struct.unpack("f" * 1, ds.GetRasterBand(1).ReadRaster())[0]
        assert data == pytest.approx(115 / (1200.0 / 3937)), "Bad value"

        # Both transforms to regular VRT
        gdal.GetDriverByName("GTiff").CreateCopy("tmp/dem.tif", src_ds)
        gdal.Warp(
            "tmp/tmp.vrt",
            "tmp/dem.tif",
            format="VRT",
            srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs",
            dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=./tmp/grid2.gtx +vunits=m +no_defs",
        )
        ds = gdal.Open("tmp/tmp.vrt")
        data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
        ds = None
        gdal.Unlink("tmp/dem.tif")
        gdal.Unlink("tmp/tmp.vrt")
        assert data == 115, "Bad value"

    # Missing grid in forward path, but this is OK
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=@i_dont_exist.tif +vunits=m +no_defs",
        dstSRS="EPSG:4979",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    # Missing grid in inverse path but this is OK
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +no_defs",
        dstSRS="+proj=longlat +datum=WGS84 +geoidgrids=@i_dont_exist.tif +vunits=m +no_defs",
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    # Forward transform with explicit m unit
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.ImportFromProj4(
        "+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs"
    )
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100)
    src_ds.GetRasterBand(1).SetUnitType("m")

    ds = gdal.Warp("", src_ds, format="MEM", dstSRS="EPSG:4979")
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    # Forward transform with explicit ft unit
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1, 1, gdal.GDT_Float32)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.ImportFromProj4(
        "+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs"
    )
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100 / 0.3048)
    src_ds.GetRasterBand(1).SetUnitType("ft")

    ds = gdal.Warp(
        "", src_ds, format="MEM", dstSRS="EPSG:4979", outputType=gdal.GDT_Byte
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    # Forward transform with explicit US survey foot unit
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1, 1, gdal.GDT_Float32)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.ImportFromProj4(
        "+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs"
    )
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100 / 0.3048006096012192)
    src_ds.GetRasterBand(1).SetUnitType("US survey foot")

    ds = gdal.Warp(
        "", src_ds, format="MEM", dstSRS="EPSG:4979", outputType=gdal.GDT_Byte
    )
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    # Forward transform with explicit unhandled unit
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.ImportFromProj4(
        "+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/grid.gtx +vunits=m +no_defs"
    )
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100)
    src_ds.GetRasterBand(1).SetUnitType("unhandled")

    with gdaltest.error_handler():
        ds = gdal.Warp("", src_ds, format="MEM", dstSRS="EPSG:4979")
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 120, "Bad value"

    # Transform to same CRS (implicit)
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.SetFromUserInput("EPSG:6597+6360")
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100)

    ds = gdal.Warp("", src_ds, format="MEM")
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    # Transform to same CRS (explicit)
    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    sr = osr.SpatialReference()
    sr.SetFromUserInput("EPSG:6597+6360")
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).Fill(100)

    ds = gdal.Warp("", src_ds, format="MEM", dstSRS="EPSG:6597+6360")
    data = struct.unpack("B" * 1, ds.GetRasterBand(1).ReadRaster())[0]
    assert data == 100, "Bad value"

    grid_ds = gdal.GetDriverByName("GTX").Create(
        "tmp/empty_grid.gtx", 3, 3, 1, gdal.GDT_Float32
    )
    sr = osr.SpatialReference()
    sr.SetFromUserInput("WGS84")
    grid_ds.SetProjection(sr.ExportToWkt())
    grid_ds.SetGeoTransform([-180 - 90, 180, 0, 90 + 45, 0, -90])
    grid_ds.GetRasterBand(1).Fill(-88.8888)
    grid_ds = None

    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([500000, 1, 0, 4000000, 0, -1])
    src_ds.GetRasterBand(1).Fill(100)

    if osr.GetPROJVersionMajor() >= 8:
        # Test missing shift values in area of interest
        with pytest.raises(Exception):
            gdal.Warp(
                "",
                src_ds,
                format="MEM",
                srcSRS="+proj=utm +zone=31 +datum=WGS84 +units=m +geoidgrids=./tmp/empty_grid.gtx +vunits=m +no_defs",
                dstSRS="EPSG:4979",
            )

    gdal.GetDriverByName("GTiff").Delete("tmp/grid.gtx")
    gdal.GetDriverByName("GTiff").Delete("tmp/grid2.gtx")
    gdal.GetDriverByName("GTiff").Delete("tmp/empty_grid.gtx")


###############################################################################
# Test error code path linked with failed warper initialization


def test_gdalwarp_lib_136():

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="MEM",
            warpOptions=["CUTLINE=invalid"],
        )

    with pytest.raises(Exception):
        gdal.Warp(
            "",
            "../gcore/data/utmsmall.tif",
            format="VRT",
            warpOptions=["CUTLINE=invalid"],
        )


###############################################################################
# Test warping two input datasets with different SRS, with no explicit target SRS


def test_gdalwarp_lib_several_sources_with_different_srs_no_explicit_target_srs():
    src_ds = gdal.Open("../gcore/data/byte.tif")
    src_ds_32611_left = gdal.Translate(
        "", src_ds, format="MEM", srcWin=[0, 0, 10, 20], outputSRS="EPSG:32611"
    )
    src_ds_32611_right = gdal.Translate(
        "", src_ds, format="MEM", srcWin=[10, 0, 10, 20], outputSRS="EPSG:32611"
    )
    src_ds_4326_right = gdal.Warp(
        "", src_ds_32611_right, format="MEM", dstSRS="EPSG:4326"
    )
    out_ds = gdal.Warp("", [src_ds_4326_right, src_ds_32611_left], format="MEM")
    assert out_ds is not None
    assert out_ds.RasterXSize == 23
    cs = out_ds.GetRasterBand(1).Checksum()
    assert cs == 5048


###############################################################################
# Test fix for https://trac.osgeo.org/gdal/ticket/7243


def test_gdalwarp_lib_touching_dateline():

    src_ds = gdal.GetDriverByName("MEM").Create("", 100, 100)
    src_ds.SetGeoTransform([-2050000, 500, 0, 2100000, 0, -500])
    sr = osr.SpatialReference()
    sr.ImportFromEPSG(3411)
    src_ds.SetProjection(sr.ExportToWkt())
    out_ds = gdal.Warp("", src_ds, dstSRS="EPSG:4326", format="MEM")
    assert out_ds.RasterXSize == 319


###############################################################################
# Test fix for https://trac.osgeo.org/gdal/ticket/7245


def test_gdalwarp_lib_override_default_output_nodata():

    drv = gdal.GetDriverByName("netCDF")
    if drv is None:
        pytest.skip()

    creationoptionlist = drv.GetMetadataItem("DMD_CREATIONOPTIONLIST")
    formats = ["NC"]
    if "<Value>NC2</Value>" in creationoptionlist:
        formats += ["NC2"]
    if "<Value>NC4</Value>" in creationoptionlist:
        formats += ["NC4", "NC4C"]

    for frmt in formats:
        gdal.Warp(
            "tmp/out.nc",
            "../gcore/data/byte.tif",
            srcNodata=255,
            format="netCDF",
            creationOptions=["FORMAT=" + frmt],
        )
        ds = gdal.Open("tmp/out.nc")
        assert ds.GetRasterBand(1).GetNoDataValue() == 255, frmt
        assert ds.GetProjection() != "", frmt
        ds = None
        os.unlink("tmp/out.nc")


###############################################################################
# Test automatting setting (or not) of SKIP_NOSOURCE=YES


def test_gdalwarp_lib_auto_skip_nosource():

    sr = osr.SpatialReference()
    sr.ImportFromEPSG(4326)

    src_ds = gdal.GetDriverByName("MEM").Create("", 1000, 500)
    src_ds.GetRasterBand(1).Fill(255)
    src_ds.SetGeoTransform([2, 0.001, 0, 49, 0, -0.001])
    src_ds.SetProjection(sr.ExportToWkt())

    tmpfilename = "/vsimem/test_gdalwarp_lib_auto_skip_nosource.tif"

    for options in [
        "-wo SKIP_NOSOURCE=NO",
        "",
        "-wo INIT_DEST=0",
        "-wo INIT_DEST=NO_DATA",
        "-dstnodata 0",
    ]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            src_ds,
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of GTiff " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 41500, (options, cs)

    # Same with MEM
    for options in ["", "-wo INIT_DEST=0", "-dstnodata 0"]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            src_ds,
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of MEM " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 41500, (options, cs)

    # Use fill/nodata at 1
    for options in [  # '-wo SKIP_NOSOURCE=NO -dstnodata 1',
        "-dstnodata 1",
        "-dstnodata 1 -wo INIT_DEST=NO_DATA",
        "-dstnodata 1 -wo INIT_DEST=1",
    ]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            src_ds,
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of GTiff " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 51132, (options, cs)

    # Same with MEM
    for options in [  # '-wo SKIP_NOSOURCE=NO -dstnodata 1',
        "-dstnodata 1",
        "-dstnodata 1 -wo INIT_DEST=NO_DATA",
        "-dstnodata 1 -wo INIT_DEST=1",
    ]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            src_ds,
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of MEM " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 51132, (options, cs)

    # Rather dummy: use a INIT_DEST different of the target dstnodata
    for options in [  # '-wo SKIP_NOSOURCE=NO -dstnodata 1 -wo INIT_DEST=0',
        "-dstnodata 127 -wo INIT_DEST=0"
    ]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            src_ds,
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of GTiff " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 41500, (options, cs)

    # Test with 2 input datasets
    src_ds1 = gdal.GetDriverByName("MEM").Create("", 500, 500)
    src_ds1.GetRasterBand(1).Fill(255)
    src_ds1.SetGeoTransform([2, 0.001, 0, 49, 0, -0.001])
    src_ds1.SetProjection(sr.ExportToWkt())

    src_ds2 = gdal.GetDriverByName("MEM").Create("", 500, 500)
    src_ds2.GetRasterBand(1).Fill(255)
    src_ds2.SetGeoTransform([2.5, 0.001, 0, 49, 0, -0.001])
    src_ds2.SetProjection(sr.ExportToWkt())

    for options in [""]:
        if gdal.VSIStatL(tmpfilename) is not None:
            gdal.Unlink(tmpfilename)
        out_ds = gdal.Warp(
            tmpfilename,
            [src_ds1, src_ds2],
            options="-te 1.5 48 3.5 49.5 -wm 100000 " + "-of GTiff " + options,
        )
        cs = out_ds.GetRasterBand(1).Checksum()
        assert cs == 41500, (options, cs)

    gdal.Unlink(tmpfilename)


###############################################################################
# Test warping a full EPSG:4326 extent to +proj=ortho
# (https://github.com/OSGeo/gdal/issues/862)


def test_gdalwarp_lib_to_ortho():

    out_ds = gdal.Warp(
        "/tmp/out.tif",
        "../gdrivers/data/small_world.tif",
        options='-of MEM -t_srs "+proj=ortho +datum=WGS84" -ts 1024 1024',
    )

    line = out_ds.GetRasterBand(1).ReadRaster(0, 0, out_ds.RasterXSize, 1)
    line = struct.unpack("B" * out_ds.RasterXSize, line)
    # Fail if the first line is completely black
    assert line.count(0) != out_ds.RasterXSize, "first line is completely black"

    line = out_ds.GetRasterBand(1).ReadRaster(
        0, out_ds.RasterYSize - 1, out_ds.RasterXSize, 1
    )
    line = struct.unpack("B" * out_ds.RasterXSize, line)
    # Fail if the last line is completely black
    assert line.count(0) != out_ds.RasterXSize, "last line is completely black"


###############################################################################
def test_gdalwarp_lib_insufficient_dst_band_count():

    src_ds = gdal.Translate("", "../gcore/data/byte.tif", options="-of MEM -b 1 -b 1")
    dst_ds = gdal.Translate("", "../gcore/data/byte.tif", options="-of MEM")
    with pytest.raises(Exception):
        gdal.Warp(dst_ds, src_ds)


###############################################################################
# Test -ct


def test_gdalwarp_lib_ct():

    dstDS = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        options='-r cubic -f MEM -t_srs EPSG:4326 -ct "proj=pipeline step inv proj=utm zone=11 ellps=clrk66 step proj=unitconvert xy_in=rad xy_out=deg step proj=axisswap order=2,1"',
    )

    assert dstDS.GetRasterBand(1).Checksum() == 4705, "Bad checksum"


def test_gdalwarp_lib_ct_wkt():

    wkt = """CONCATENATEDOPERATION["Inverse of UTM zone 11N + Null geographic offset from NAD27 to WGS 84",
    SOURCECRS[
        PROJCRS["NAD27 / UTM zone 11N",
            BASEGEOGCRS["NAD27",
                DATUM["North American Datum 1927",
                    ELLIPSOID["Clarke 1866",6378206.4,294.978698213898,
                        LENGTHUNIT["metre",1]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433]]],
            CONVERSION["UTM zone 11N",
                METHOD["Transverse Mercator",
                    ID["EPSG",9807]],
                PARAMETER["Latitude of natural origin",0,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8801]],
                PARAMETER["Longitude of natural origin",-117,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8802]],
                PARAMETER["Scale factor at natural origin",0.9996,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8805]],
                PARAMETER["False easting",500000,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8806]],
                PARAMETER["False northing",0,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8807]]],
            CS[Cartesian,2],
                AXIS["(E)",east,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["(N)",north,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
            USAGE[
                SCOPE["unknown"],
                AREA["North America - 120°W to 114°W and NAD27 by country - onshore"],
                BBOX[26.93,-120,78.13,-114]],
            ID["EPSG",26711]]],
    TARGETCRS[
        GEOGCRS["WGS 84",
            DATUM["World Geodetic System 1984",
                ELLIPSOID["WGS 84",6378137,298.257223563,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            USAGE[
                SCOPE["unknown"],
                AREA["World"],
                BBOX[-90,-180,90,180]],
            ID["EPSG",4326]]],
    STEP[
        CONVERSION["Inverse of UTM zone 11N",
            METHOD["Inverse of Transverse Mercator",
                ID["INVERSE(EPSG)",9807]],
            PARAMETER["Latitude of natural origin",0,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8801]],
            PARAMETER["Longitude of natural origin",-117,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8802]],
            PARAMETER["Scale factor at natural origin",0.9996,
                SCALEUNIT["unity",1],
                ID["EPSG",8805]],
            PARAMETER["False easting",500000,
                LENGTHUNIT["metre",1],
                ID["EPSG",8806]],
            PARAMETER["False northing",0,
                LENGTHUNIT["metre",1],
                ID["EPSG",8807]],
            ID["INVERSE(EPSG)",16011]]],
    STEP[
        COORDINATEOPERATION["Null geographic offset from NAD27 to WGS 84",
            SOURCECRS[
                GEOGCRS["NAD27",
                    DATUM["North American Datum 1927",
                        ELLIPSOID["Clarke 1866",6378206.4,294.978698213898,
                            LENGTHUNIT["metre",1]]],
                    PRIMEM["Greenwich",0,
                        ANGLEUNIT["degree",0.0174532925199433]],
                    CS[ellipsoidal,2],
                        AXIS["geodetic latitude (Lat)",north,
                            ORDER[1],
                            ANGLEUNIT["degree",0.0174532925199433]],
                        AXIS["geodetic longitude (Lon)",east,
                            ORDER[2],
                            ANGLEUNIT["degree",0.0174532925199433]],
                    USAGE[
                        SCOPE["unknown"],
                        AREA["North America - NAD27"],
                        BBOX[7.15,167.65,83.17,-47.74]],
                    ID["EPSG",4267]]],
            TARGETCRS[
                GEOGCRS["WGS 84",
                    DATUM["World Geodetic System 1984",
                        ELLIPSOID["WGS 84",6378137,298.257223563,
                            LENGTHUNIT["metre",1]]],
                    PRIMEM["Greenwich",0,
                        ANGLEUNIT["degree",0.0174532925199433]],
                    CS[ellipsoidal,2],
                        AXIS["geodetic latitude (Lat)",north,
                            ORDER[1],
                            ANGLEUNIT["degree",0.0174532925199433]],
                        AXIS["geodetic longitude (Lon)",east,
                            ORDER[2],
                            ANGLEUNIT["degree",0.0174532925199433]],
                    USAGE[
                        SCOPE["unknown"],
                        AREA["World"],
                        BBOX[-90,-180,90,180]],
                    ID["EPSG",4326]]],
            METHOD["Geographic2D offsets",
                ID["EPSG",9619]],
            PARAMETER["Latitude offset",0,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8601]],
            PARAMETER["Longitude offset",0,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8602]],
            USAGE[
                SCOPE["unknown"],
                AREA["World"],
                BBOX[-90,-180,90,180]]]],
    USAGE[
        SCOPE["unknown"],
        AREA["World"],
        BBOX[-90,-180,90,180]]]"""

    dstDS = gdal.Warp(
        "",
        "../gcore/data/byte.tif",
        resampleAlg=gdal.GRA_Cubic,
        format="MEM",
        dstSRS="EPSG:4326",
        coordinateOperation=wkt,
    )

    assert dstDS.GetRasterBand(1).Checksum() == 4705, "Bad checksum"


###############################################################################
# Test warping from a RPC dataset to a new dataset larger than needed


def test_gdalwarp_lib_restrict_output_dataset_warp_rpc_new():

    dstDS = gdal.Warp(
        "",
        "data/unstable_rpc_with_dem_source.tif",
        options="-f MEM -et 0 -to RPC_DEM=data/unstable_rpc_with_dem_elevation.tif -to RPC_MAX_ITERATIONS=40 -to RPC_DEM_MISSING_VALUE=0 -t_srs EPSG:3857 -te 12693400.445 2547311.740 12700666.740 2553269.051 -ts 380 311",
    )
    cs = dstDS.GetRasterBand(1).Checksum()
    assert cs == 53230

    with gdaltest.config_option("RESTRICT_OUTPUT_DATASET_UPDATE", "NO"):
        dstDS = gdal.Warp(
            "",
            "data/unstable_rpc_with_dem_source.tif",
            options="-f MEM -et 0 -to RPC_DEM=data/unstable_rpc_with_dem_elevation.tif -to RPC_MAX_ITERATIONS=40 -to RPC_DEM_MISSING_VALUE=0 -t_srs EPSG:3857 -te 12693400.445 2547311.740 12700666.740 2553269.051 -ts 380 311",
        )
    cs = dstDS.GetRasterBand(1).Checksum()
    assert cs != 53230


###############################################################################
# Test warping from a RPC dataset to an existing dataset


def test_gdalwarp_lib_restrict_output_dataset_warp_rpc_existing():

    dstDS = gdal.Translate(
        "", "data/unstable_rpc_with_dem_blank_output.tif", format="MEM"
    )
    gdal.Warp(
        dstDS,
        "data/unstable_rpc_with_dem_source.tif",
        options="-et 0 -to RPC_DEM=data/unstable_rpc_with_dem_elevation.tif -to RPC_MAX_ITERATIONS=40 -to RPC_DEM_MISSING_VALUE=0",
    )
    cs = dstDS.GetRasterBand(1).Checksum()
    assert cs == 53230


###############################################################################
# Test warping from a RPC dataset to an existing dataset that doesn't intersect
# source extent defined by RPC


def test_gdalwarp_lib_restrict_output_dataset_warp_rpc_existing_no_intersection():

    dstDS = gdal.Translate(
        "",
        "data/unstable_rpc_with_dem_blank_output.tif",
        format="MEM",
        outputBounds=[112693400.445, 2553269.051, 112700666.740, 2547311.740],
    )
    gdal.ErrorReset()
    assert (
        gdal.Warp(
            dstDS,
            "data/unstable_rpc_with_dem_source.tif",
            options="-et 0 -to RPC_DEM=data/unstable_rpc_with_dem_elevation.tif "
            + "-to RPC_MAX_ITERATIONS=40 -to RPC_DEM_MISSING_VALUE=0",
        )
        == 1
    )
    assert gdal.GetLastErrorType() == gdal.CE_None
    cs = dstDS.GetRasterBand(1).Checksum()
    assert cs == 0


###############################################################################
# Test warping from a RPC dataset to an existing dataset, with using RPC_FOOTPRINT


@pytest.mark.require_geos
def test_gdalwarp_lib_restrict_output_dataset_warp_rpc_existing_RPC_FOOTPRINT():

    with gdaltest.config_option("RESTRICT_OUTPUT_DATASET_UPDATE", "NO"):
        dstDS = gdal.Translate(
            "", "data/unstable_rpc_with_dem_blank_output.tif", format="MEM"
        )
        gdal.Warp(
            dstDS,
            "data/unstable_rpc_with_dem_source.tif",
            options='-et 0 -to RPC_DEM=data/unstable_rpc_with_dem_elevation.tif -to RPC_MAX_ITERATIONS=40 -to RPC_DEM_MISSING_VALUE=0 -to "RPC_FOOTPRINT=POLYGON ((114.070906445526 22.329620213341,114.085953272341 22.3088955493586,114.075520805749 22.3027084861851,114.060942102434 22.3236815197571,114.060942102434 22.3236815197571,114.060942102434 22.3236815197571,114.060942102434 22.3236815197571,114.070906445526 22.329620213341))"',
        )
        cs = dstDS.GetRasterBand(1).Checksum()
        assert cs == 53230


###############################################################################
# Test warping from EPSG:4326 to EPSG:3857


def test_gdalwarp_lib_bug_4326_to_3857():

    ds = gdal.Warp(
        "",
        "data/test_bug_4326_to_3857.tif",
        options="-f MEM -t_srs EPSG:3857 -ts 20 20",
    )
    cs = ds.GetRasterBand(1).Checksum()
    assert cs == 4672


###############################################################################
# Test warping of single source to COG


def test_gdalwarp_lib_to_cog():

    tmpfilename = "/vsimem/cog.tif"
    ds = gdal.Warp(
        tmpfilename,
        "../gcore/data/byte.tif",
        options="-f COG -t_srs EPSG:3857 -ts 20 20",
    )
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == 4672
    ds = None
    gdal.Unlink(tmpfilename)


###############################################################################
# Test warping of single source to COG with reprojection options


def test_gdalwarp_lib_to_cog_reprojection_options():

    tmpfilename = "/vsimem/cog.tif"
    ds = gdal.Warp(
        tmpfilename,
        "../gcore/data/byte.tif",
        options="-f COG -co TILING_SCHEME=GoogleMapsCompatible",
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() in (
        4187,
        4300,
        4186,
    )  # 4300 on Mac, 4186 on Mac / Conda
    assert ds.GetRasterBand(2).Checksum() == 4415
    ds = None
    gdal.Unlink(tmpfilename)


###############################################################################
# Test warping of multiple source, compatible of BuildVRT mosaicing, to COG


def test_gdalwarp_lib_multiple_source_compatible_buildvrt_to_cog():

    tmpfilename = "/vsimem/cog.tif"
    left_ds = gdal.Translate(
        "/vsimem/left.tif", "../gcore/data/byte.tif", options="-srcwin 0 0 10 20"
    )
    right_ds = gdal.Translate(
        "/vsimem/right.tif", "../gcore/data/byte.tif", options="-srcwin 10 0 10 20"
    )
    ds = gdal.Warp(tmpfilename, [left_ds, right_ds], options="-f COG")
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == 4672
    ds = None
    gdal.Unlink(tmpfilename)
    gdal.Unlink("/vsimem/left.tif")
    gdal.Unlink("/vsimem/right.tif")


###############################################################################
# Test warping of multiple source, compatible of BuildVRT mosaicing, to COG,
# with reprojection options


def test_gdalwarp_lib_multiple_source_compatible_buildvrt_to_cog_reprojection_options():

    tmpfilename = "/vsimem/cog.tif"
    left_ds = gdal.Translate(
        "/vsimem/left.tif", "../gcore/data/byte.tif", options="-srcwin 0 0 10 20"
    )
    right_ds = gdal.Translate(
        "/vsimem/right.tif", "../gcore/data/byte.tif", options="-srcwin 10 0 10 20"
    )
    ds = gdal.Warp(
        tmpfilename,
        [left_ds, right_ds],
        options="-f COG -co TILING_SCHEME=GoogleMapsCompatible",
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() in (
        4187,
        4300,
        4186,
    )  # 4300 on Mac, 4186 on Mac / Conda
    assert ds.GetRasterBand(2).Checksum() == 4415
    ds = None
    gdal.Unlink(tmpfilename)
    gdal.Unlink("/vsimem/left.tif")
    gdal.Unlink("/vsimem/right.tif")


###############################################################################
# Test warping of multiple source, incompatible of BuildVRT mosaicing, to COG


def test_gdalwarp_lib_multiple_source_incompatible_buildvrt_to_cog():

    tmpfilename = "/vsimem/cog.tif"
    left_ds = gdal.Translate(
        "/vsimem/left.tif",
        "../gcore/data/byte.tif",
        options="-srcwin 0 0 15 20 -b 1 -b 1 -colorinterp_2 alpha -scale_2 0 255 255 255",
    )
    right_ds = gdal.Translate(
        "/vsimem/right.tif",
        "../gcore/data/byte.tif",
        options="-srcwin 5 0 15 20 -b 1 -b 1 -colorinterp_2 alpha -scale_2 0 255 255 255",
    )
    ds = gdal.Warp(tmpfilename, [left_ds, right_ds], options="-f COG")
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == 4672
    assert ds.GetRasterBand(2).Checksum() == 4873
    ds = None
    gdal.Unlink(tmpfilename)
    gdal.Unlink("/vsimem/left.tif")
    gdal.Unlink("/vsimem/right.tif")


###############################################################################
# Test warping of multiple source, incompatible of BuildVRT mosaicing, to COG,
# with reprojection options


def test_gdalwarp_lib_multiple_source_incompatible_buildvrt_to_cog_reprojection_options():

    tmpfilename = "/vsimem/cog.tif"
    left_ds = gdal.Translate(
        "/vsimem/left.tif",
        "../gcore/data/byte.tif",
        options="-srcwin 0 0 15 20 -b 1 -b 1 -colorinterp_2 alpha -scale_2 0 255 255 255",
    )
    right_ds = gdal.Translate(
        "/vsimem/right.tif",
        "../gcore/data/byte.tif",
        options="-srcwin 5 0 15 20 -b 1 -b 1 -colorinterp_2 alpha -scale_2 0 255 255 255",
    )
    ds = gdal.Warp(
        tmpfilename,
        [left_ds, right_ds],
        options="-f COG -co TILING_SCHEME=GoogleMapsCompatible",
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() in (
        4207,
        4315,
        4206,
    )  # 4300 on Mac, 4206 on Mac / Conda
    assert ds.GetRasterBand(2).Checksum() == 4415
    ds = None
    gdal.Unlink(tmpfilename)
    gdal.Unlink("/vsimem/left.tif")
    gdal.Unlink("/vsimem/right.tif")


###############################################################################


def test_gdalwarp_lib_no_crs():

    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([0, 10, 0, 0, 0, -10])
    out_ds = gdal.Warp(
        "", src_ds, options='-of MEM -ct "+proj=unitconvert +xy_in=1 +xy_out=2"'
    )
    assert out_ds.GetGeoTransform() == (0.0, 5.0, 0.0, 0.0, 0.0, -5.0)


###############################################################################
# Test that the warp kernel properly computes the resampling kernel xsize
# when wrapping along the antimeridian (related to #2754)


def test_gdalwarp_lib_xscale_antimeridian():

    sr = osr.SpatialReference()
    sr.SetFromUserInput("WGS84")

    src1_ds = gdal.GetDriverByName("GTiff").Create("/vsimem/src1.tif", 1000, 1000)
    src1_ds.SetGeoTransform([179, 0.001, 0, 50, 0, -0.001])
    src1_ds.SetProjection(sr.ExportToWkt())
    src1_ds.GetRasterBand(1).Fill(100)
    src1_ds = None

    src2_ds = gdal.GetDriverByName("GTiff").Create("/vsimem/src2.tif", 1000, 1000)
    src2_ds.SetGeoTransform([-180, 0.001, 0, 50, 0, -0.001])
    src2_ds.SetProjection(sr.ExportToWkt())
    src2_ds.GetRasterBand(1).Fill(200)
    src2_ds = None

    source = gdal.BuildVRT("", ["/vsimem/src1.tif", "/vsimem/src2.tif"])
    # Wrap to UTM zone 1 across the antimeridian
    ds = gdal.Warp(
        "",
        source,
        options="-of MEM -t_srs EPSG:32601 -te 276000 5464000 290000 5510000 -tr 1000 1000 -r cubic",
    )
    vals = struct.unpack("B" * ds.RasterXSize * ds.RasterYSize, ds.ReadRaster())
    assert vals[0] == 100
    assert vals[ds.RasterXSize - 1] == 200
    # Check that the set of values is just 100 and 200. If the xscale was wrong,
    # we would take intou account 0 values outsize of the 2 tiles.
    assert set(vals) == set([100, 200])

    gdal.Unlink("/vsimem/src1.tif")
    gdal.Unlink("/vsimem/src2.tif")


###############################################################################
# Test gdalwarp preserves scale & offset of bands


def test_gdalwarp_lib_scale_offset():

    sr = osr.SpatialReference()
    sr.SetFromUserInput("WGS84")

    src_ds = gdal.GetDriverByName("MEM").Create("", 1, 1)
    src_ds.SetGeoTransform([2, 1, 0, 49, 0, -1])
    src_ds.SetProjection(sr.ExportToWkt())
    src_ds.GetRasterBand(1).SetScale(1.5)
    src_ds.GetRasterBand(1).SetOffset(2.5)

    ds = gdal.Warp("", src_ds, format="MEM")
    assert ds.GetRasterBand(1).GetScale() == 1.5
    assert ds.GetRasterBand(1).GetOffset() == 2.5


###############################################################################
# Test cutline with zero-width sliver


def test_gdalwarp_lib_cutline_zero_width_sliver():

    # Geometry valid in EPSG:4326, but that has a zero-width sliver
    # at point [-90.783634, 33.612466] that results in an invalid geometry in UTM
    geojson = '{"type": "MultiPolygon", "coordinates": [[[[-90.789474, 33.608456], [-90.789675, 33.609965], [-90.789688, 33.610022], [-90.789668, 33.610318], [-90.78966, 33.610722], [-90.789598, 33.612225], [-90.789593, 33.612305], [-90.78956, 33.612358], [-90.789475, 33.612365], [-90.789072, 33.61237], [-90.788643, 33.612367], [-90.787938, 33.612375], [-90.787155, 33.612393], [-90.785787, 33.612403], [-90.785132, 33.612425], [-90.784582, 33.612435], [-90.783712, 33.612472],     [-90.783634, 33.612466],     [-90.783647, 33.612467], [-90.783198, 33.612472], [-90.781774, 33.61249], [-90.78104, 33.612511], [-90.780976, 33.612288], [-90.781022, 33.612023], [-90.781033, 33.61179], [-90.781019, 33.611549], [-90.781033, 33.611299], [-90.781055, 33.610906], [-90.781055, 33.610575], [-90.781094, 33.610042], [-90.781084, 33.608534], [-90.781924, 33.608439], [-90.781946, 33.607715], [-90.782421, 33.607559], [-90.78367, 33.607845], [-90.783573, 33.609717], [-90.783741, 33.609384], [-90.784017, 33.607994], [-90.784507, 33.608018], [-90.785483, 33.608138], [-90.787171, 33.608301], [-90.789474, 33.608456]]]]}'
    gdal.FileFromMemBuffer("/vsimem/cutline.geojson", geojson)
    src_ds = gdal.GetDriverByName("MEM").Create("", 968, 751)
    srs = osr.SpatialReference()
    srs.ImportFromEPSG(32615)
    src_ds.SetSpatialRef(srs)
    src_ds.SetGeoTransform([690129, 30, 0, 3723432, 0, -30])
    ds = gdal.Warp("", src_ds, format="MEM", cutlineDSName="/vsimem/cutline.geojson")
    assert ds is not None


###############################################################################
# Test support for propagating coordinate epoch


def test_gdalwarp_lib_propagating_coordinate_epoch():

    src_ds = gdal.Translate(
        "",
        "../gcore/data/byte.tif",
        options="-of MEM -a_srs EPSG:32611 -a_coord_epoch 2021.3",
    )
    ds = gdal.Warp("", src_ds, format="MEM")
    srs = ds.GetSpatialRef()
    assert srs.GetCoordinateEpoch() == 2021.3
    ds = None


###############################################################################
# Test support for -s_coord_epoch


@pytest.mark.require_proj(7, 2)
def test_gdalwarp_lib_s_coord_epoch():

    src_ds = gdal.GetDriverByName("MEM").Create("", 2, 2)
    src_ds.SetGeoTransform([120, 1e-7, 0, -40, 0, -1e-7])

    # ITRF2014 to GDA2020
    ds = gdal.Warp(
        "",
        src_ds,
        options="-of MEM -s_srs EPSG:9000 -s_coord_epoch 2030 -t_srs EPSG:7844",
    )
    srs = ds.GetSpatialRef()
    assert srs.GetCoordinateEpoch() == 0
    gt = ds.GetGeoTransform()
    assert abs(gt[0] - 120) > 1e-15 and abs(gt[0] - 120) < 1e-5
    assert abs(gt[3] - -40) > 1e-15 and abs(gt[3] - -40) < 1e-5
    ds = None


###############################################################################
# Test support for -s_coord_epoch


@pytest.mark.require_proj(7, 2)
def test_gdalwarp_lib_t_coord_epoch():

    src_ds = gdal.GetDriverByName("MEM").Create("", 2, 2)
    src_ds.SetGeoTransform([120, 1e-7, 0, -40, 0, -1e-7])

    # GDA2020 to ITRF2014
    ds = gdal.Warp(
        "",
        src_ds,
        options="-of MEM -t_srs EPSG:9000 -t_coord_epoch 2030 -s_srs EPSG:7844",
    )
    srs = ds.GetSpatialRef()
    assert srs.GetCoordinateEpoch() == 2030.0
    gt = ds.GetGeoTransform()
    assert abs(gt[0] - 120) > 1e-15 and abs(gt[0] - 120) < 1e-5
    assert abs(gt[3] - -40) > 1e-15 and abs(gt[3] - -40) < 1e-5
    ds = None


###############################################################################
# Test automatic grid sampling


def test_gdalwarp_lib_automatic_grid_sampling():

    ds = gdal.Warp(
        "",
        "../gdrivers/data/small_world.tif",
        format="MEM",
        outputBounds=[-7655830, -6385994, 7152182, 8423302],
        dstSRS="+proj=laea +lat_0=48.514 +lon_0=-145.204 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs",
    )
    assert ds.GetRasterBand(1).Checksum() == 46790


###############################################################################
# Test source nodata with destination alpha


def test_gdalwarp_lib_src_nodata_with_dstalpha():

    src_ds = gdal.GetDriverByName("MEM").Create("", 3, 1, 3)
    src_ds.SetGeoTransform([2, 1, 0, 49, 0, -1])
    srs = osr.SpatialReference()
    srs.ImportFromEPSG(32615)
    src_ds.SetSpatialRef(srs)
    src_ds.GetRasterBand(1).SetNoDataValue(1)
    src_ds.GetRasterBand(1).WriteRaster(0, 0, 3, 1, struct.pack("B" * 3, 10, 1, 1))
    src_ds.GetRasterBand(2).SetNoDataValue(2)
    src_ds.GetRasterBand(2).WriteRaster(0, 0, 3, 1, struct.pack("B" * 3, 20, 2, 2))
    src_ds.GetRasterBand(3).SetNoDataValue(3)
    src_ds.GetRasterBand(3).WriteRaster(0, 0, 3, 1, struct.pack("B" * 3, 30, 3, 127))

    # By default, a target pixel is invalid if all source pixels are invalid,
    # but when warping each band, its individual nodata status is taken into
    # account
    ds = gdal.Warp("", src_ds, format="MEM", dstAlpha=True)
    assert ds.GetRasterBand(1).GetNoDataValue() is None
    assert struct.unpack("B" * 3, ds.GetRasterBand(1).ReadRaster()) == (10, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(2).ReadRaster()) == (20, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(3).ReadRaster()) == (30, 0, 127)
    assert struct.unpack("B" * 3, ds.GetRasterBand(4).ReadRaster()) == (255, 0, 255)

    # Same as above
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        dstAlpha=True,
        warpOptions=["UNIFIED_SRC_NODATA=PARTIAL"],
    )
    assert ds.GetRasterBand(1).GetNoDataValue() is None
    assert struct.unpack("B" * 3, ds.GetRasterBand(1).ReadRaster()) == (10, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(2).ReadRaster()) == (20, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(3).ReadRaster()) == (30, 0, 127)
    assert struct.unpack("B" * 3, ds.GetRasterBand(4).ReadRaster()) == (255, 0, 255)

    # In UNIFIED_SRC_NODATA=NO, target pixels will always be valid
    ds = gdal.Warp(
        "", src_ds, format="MEM", dstAlpha=True, warpOptions=["UNIFIED_SRC_NODATA=NO"]
    )
    assert ds.GetRasterBand(1).GetNoDataValue() is None
    assert struct.unpack("B" * 3, ds.GetRasterBand(1).ReadRaster()) == (10, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(2).ReadRaster()) == (20, 0, 0)
    assert struct.unpack("B" * 3, ds.GetRasterBand(3).ReadRaster()) == (30, 0, 127)
    assert struct.unpack("B" * 3, ds.GetRasterBand(4).ReadRaster()) == (255, 255, 255)

    # In UNIFIED_SRC_NODATA=YES, a target pixel is invalid if all source pixels are invalid,
    # and the validty status of each band is determined by this unified validity
    ds = gdal.Warp(
        "", src_ds, format="MEM", dstAlpha=True, warpOptions=["UNIFIED_SRC_NODATA=YES"]
    )
    assert ds.GetRasterBand(1).GetNoDataValue() is None
    assert struct.unpack("B" * 3, ds.GetRasterBand(1).ReadRaster()) == (10, 0, 1)
    assert struct.unpack("B" * 3, ds.GetRasterBand(2).ReadRaster()) == (20, 0, 2)
    assert struct.unpack("B" * 3, ds.GetRasterBand(3).ReadRaster()) == (30, 0, 127)
    assert struct.unpack("B" * 3, ds.GetRasterBand(4).ReadRaster()) == (255, 0, 255)

    # Specifying srcNoData implies UNIFIED_SRC_NODATA=YES
    ds = gdal.Warp("", src_ds, format="MEM", srcNodata="1 2 3", dstAlpha=True)
    assert ds.GetRasterBand(1).GetNoDataValue() is None
    assert struct.unpack("B" * 3, ds.GetRasterBand(1).ReadRaster()) == (10, 0, 1)
    assert struct.unpack("B" * 3, ds.GetRasterBand(2).ReadRaster()) == (20, 0, 2)
    assert struct.unpack("B" * 3, ds.GetRasterBand(3).ReadRaster()) == (30, 0, 127)
    assert struct.unpack("B" * 3, ds.GetRasterBand(4).ReadRaster()) == (255, 0, 255)


###############################################################################
# Test warping from a dataset with points outside of Earth (fixes #4934)


def test_gdalwarp_lib_src_points_outside_of_earth():
    class MyHandler:
        def __init__(self):
            self.failure_raised = False

        def callback(self, err_type, err_no, err_msg):
            if err_type == gdal.CE_Failure:
                print(err_type, err_no, err_msg)
                self.failure_raised = True

    my_error_handler = MyHandler()
    with gdaltest.error_handler(my_error_handler.callback):
        gdal.Warp("", "../gdrivers/data/vrt/bug4997_intermediary.vrt", format="VRT")
    assert not my_error_handler.failure_raised


###############################################################################
# Test warping from a dataset in rotated pole projection, including the North
# pole to geographic


# Not completely sure about the minimum version to have ob_tran working fine.
@pytest.mark.require_proj(7)
def test_gdalwarp_lib_from_ob_tran_including_north_pole_to_geographic():

    ds = gdal.Warp(
        "",
        "../gdrivers/data/small_world.tif",
        format="VRT",
        dstSRS="+proj=ob_tran +o_proj=longlat +o_lon_p=189.477233886719 +o_lat_p=31.7581653594971 +lon_0=267.596992492676 +datum=WGS84 +no_defs",
        outputBounds=[32.4624074, -53.5375933, 327.538, 53.538],
        warpOptions=["SAMPLE_GRID=YES", "SOURCE_EXTRA=5"],
    )
    out_ds = gdal.Warp("", ds, format="VRT", dstSRS="EPSG:4326")
    gt = out_ds.GetGeoTransform()
    assert gt[0] == -180
    assert gt[3] == 90
    assert gt[0] + gt[1] * out_ds.RasterXSize == pytest.approx(180, abs=0.1)


###############################################################################
# Test warping from a dataset in geographic with longitudes outside [-180,180]
# to the same CRS doesn't alter the extent
# (https://github.com/OSGeo/gdal/issues/8194)


def test_gdalwarp_lib_geographic_outside_180_no_crs_change():

    src_ds = gdal.GetDriverByName("MEM").Create("", 36, 18)
    src_ds.SetGeoTransform([0, 10, 0, 90, 0, -10])
    srs = osr.SpatialReference()
    srs.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)
    srs.ImportFromEPSG(4326)
    src_ds.SetSpatialRef(srs)
    src_ds.GetRasterBand(1).Fill(1)

    ds = gdal.Warp("", src_ds, format="MEM", xRes=20, yRes=20)
    gt = ds.GetGeoTransform()
    assert ds.RasterXSize == 18
    assert ds.RasterYSize == 9
    assert gt == pytest.approx((0, 20, 0, 90, 0, -20))
    assert ds.GetRasterBand(1).ComputeRasterMinMax() == (1, 1)


###############################################################################
# Test gdalwarp foo.tif foo.tif.ovr


def test_gdalwarp_lib_generate_ovr():

    gdal.FileFromMemBuffer(
        "/vsimem/foo.tif", open("../gcore/data/byte.tif", "rb").read()
    )
    gdal.GetDriverByName("GTiff").Create("/vsimem/foo.tif.ovr", 10, 10)
    ds = gdal.Warp(
        "/vsimem/foo.tif.ovr",
        "/vsimem/foo.tif",
        options="-of GTiff -r average -ts 10 10 -overwrite",
    )
    assert ds
    assert ds.GetRasterBand(1).Checksum() != 0, "Bad checksum"
    ds = None

    gdal.GetDriverByName("GTiff").Delete("/vsimem/foo.tif")


###############################################################################
# Test not deleting auxiliary files shared by the source and a target being
# overwritten (https://github.com/OSGeo/gdal/issues/5633)


def test_gdalwarp_lib_not_delete_shared_auxiliary_files():

    # Yes, we do intend to copy a .TIF as a fake .JP2
    shutil.copy(
        "../gdrivers/data/dimap2/bundle/IMG_foo_R1C1.TIF", "tmp/IMG_foo_R1C1.JP2"
    )
    shutil.copy("../gdrivers/data/dimap2/bundle/DIM_foo.XML", "tmp/DIM_foo.XML")

    gdal.Warp("tmp/IMG_foo_R1C1.tif", "tmp/IMG_foo_R1C1.JP2")

    ds = gdal.Open("tmp/IMG_foo_R1C1.tif")
    assert len(ds.GetFileList()) == 2
    ds = None

    gdal.Warp("tmp/IMG_foo_R1C1.tif", "tmp/IMG_foo_R1C1.JP2", format="GTiff")

    ds = gdal.Open("tmp/IMG_foo_R1C1.tif")
    assert len(ds.GetFileList()) == 2
    ds = None

    os.unlink("tmp/IMG_foo_R1C1.JP2")
    os.unlink("tmp/IMG_foo_R1C1.tif")
    os.unlink("tmp/DIM_foo.XML")


###############################################################################


def test_gdalwarp_lib_issue_with_te_and_geographic_crs_world_coverage():

    # Representative of georeferencing on gfs.t18z.pgrb2.0p25.f033
    src_ds = gdal.GetDriverByName("MEM").Create("", 1440, 721)
    srs = osr.SpatialReference()
    srs.SetFromUserInput("+proj=longlat +R=6371229")
    src_ds.SetSpatialRef(srs)
    src_ds.SetGeoTransform([-180.125, 0.25, 0, 90.125, 0, -0.25])
    out_ds = gdal.Warp(
        "", src_ds, format="MEM", dstSRS="EPSG:4326", outputBounds=[-180, -90, 180, 90]
    )
    # Check that the resolution is 0.25
    assert out_ds.GetGeoTransform() == (-180, 0.25, 0, 90, 0, -0.25)


###############################################################################


def test_gdalwarp_lib_epsg_4326_to_esri_53037():

    # Scenario of https://github.com/OSGeo/gdal/issues/6155
    src_ds = gdal.GetDriverByName("MEM").Create("", 10800, 5400)
    srs = osr.SpatialReference()
    srs.ImportFromEPSG(4326)
    srs.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER)
    src_ds.SetSpatialRef(srs)
    src_ds.SetGeoTransform([-180, 0.033333333333330, 0, 90, 0, -0.033333333333330])
    # Expension of ESRI:53037 (proj.db of old PROJ releases don't know it)
    out_ds = gdal.Warp(
        "",
        src_ds,
        format="VRT",
        dstSRS="+proj=eqearth +lon_0=150 +x_0=0 +y_0=0 +R=6371008.7714 +units=m +type=crs",
    )
    assert out_ds.GetGeoTransform() == pytest.approx(
        (
            -17243961.61291527,
            3176.540597910281,
            0.0,
            8392929.693707585,
            0.0,
            -3176.540597910281,
        )
    )


###############################################################################


@pytest.mark.parametrize(
    "resampleAlg", ["average", "mode", "min", "max", "med", "q1", "q3", "sum", "rms"]
)
# 6.3.1 might not be the lowest bound, but 6.0.0 definitely doesn't work for that test
@pytest.mark.require_proj(6, 3, 1)
def test_gdalwarp_lib_epsg_4326_to_esri_102020(resampleAlg):

    # Scenario of https://github.com/OSGeo/gdal/issues/6155
    out_ds = gdal.Warp(
        "",
        "../gdrivers/data/small_world.tif",
        options="-f MEM -t_srs ESRI:102020 -te -3000000 -3000000 3000000 0 -ts 300 150 -r "
        + resampleAlg,
    )
    # Test we don't have a weird spike at the antimeridian, "below" south pole
    if resampleAlg != "sum":
        assert struct.unpack("B" * 3, out_ds.ReadRaster(149, 100, 1, 1)) == (11, 10, 50)


###############################################################################


@pytest.mark.parametrize(
    "options",
    [
        "",
        "-ts 1 1",
        "-ts 10 10",
        "-ts 40 40",
        "-t_srs EPSG:4326",
        "-t_srs EPSG:4326 -ts 11 9",
        "-t_srs EPSG:4326 -ts 100 100",
    ],
)
def test_gdalwarp_lib_sum_preserving(options):

    src_ds = gdal.Open("../gdrivers/data/byte.tif")
    out_ds = gdal.Warp("", src_ds, options="-f MEM -ot Float32 -r sum " + options)
    source_values = struct.unpack(
        "B" * (src_ds.RasterXSize * src_ds.RasterYSize), src_ds.ReadRaster()
    )
    values = struct.unpack(
        "f" * (out_ds.RasterXSize * out_ds.RasterYSize), out_ds.ReadRaster()
    )
    assert sum(source_values) == pytest.approx(sum(values), rel=1e-5)

    # Check nodata handling
    minval = src_ds.GetRasterBand(1).ComputeRasterMinMax()[0]
    out_ds = gdal.Warp(
        "",
        src_ds,
        options="-f MEM -ot Float32 -srcnodata "
        + str(minval)
        + " -dstnodata -12345 -r sum "
        + options,
    )
    source_values = struct.unpack(
        "B" * (src_ds.RasterXSize * src_ds.RasterYSize), src_ds.ReadRaster()
    )
    source_values = [x if x != minval else 0 for x in source_values]
    values = struct.unpack(
        "f" * (out_ds.RasterXSize * out_ds.RasterYSize), out_ds.ReadRaster()
    )
    values = [x if x != -12345 else 0 for x in values]
    assert sum(source_values) == pytest.approx(sum(values), rel=1e-5)


###############################################################################


def test_gdalwarp_lib_sum_preserving_multiband():

    src_ds = gdal.Open("../gdrivers/data/small_world.tif")
    out_ds = gdal.Warp("", src_ds, options="-f MEM -ot Float32 -r sum -ts 500 300")
    for i in range(src_ds.RasterCount):
        source_values = struct.unpack(
            "B" * (src_ds.RasterXSize * src_ds.RasterYSize),
            src_ds.GetRasterBand(i + 1).ReadRaster(),
        )
        values = struct.unpack(
            "f" * (out_ds.RasterXSize * out_ds.RasterYSize),
            out_ds.GetRasterBand(i + 1).ReadRaster(),
        )
        assert sum(source_values) == pytest.approx(sum(values), rel=1e-5)


###############################################################################


def test_gdalwarp_lib_sum_preserving_accross_antimeridian():

    src_ds = gdal.Translate(
        "",
        "../gcore/data/byte.tif",
        options="-f MEM -a_srs EPSG:32601 -a_ullr 165000 5000 170000 -5000",
    )
    out1_ds = gdal.Warp(
        "",
        src_ds,
        options="-f MEM -r sum -t_srs EPSG:4326 -overwrite -te 179.97 -0.05 180 0.05 -ot Float32",
    )
    out2_ds = gdal.Warp(
        "",
        src_ds,
        options="-f MEM -r sum -t_srs EPSG:4326 -overwrite -te -180 -0.05 -179.95 0.05 -ot Float32",
    )
    source_values = struct.unpack(
        "B" * (src_ds.RasterXSize * src_ds.RasterYSize), src_ds.ReadRaster()
    )
    values1 = struct.unpack(
        "f" * (out1_ds.RasterXSize * out1_ds.RasterYSize), out1_ds.ReadRaster()
    )
    values2 = struct.unpack(
        "f" * (out2_ds.RasterXSize * out2_ds.RasterYSize), out2_ds.ReadRaster()
    )
    assert sum(source_values) == pytest.approx(sum(values1) + sum(values2), rel=1e-5)


###############################################################################


def test_gdalwarp_lib_srcBands():

    # Test with single band input dataset
    ds = gdal.Warp("", "../gcore/data/byte.tif", format="MEM", srcBands=[1])
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == 4672

    ds = gdal.Warp(
        "", "../gcore/data/byte.tif", format="MEM", srcBands=[1], dstBands=[1]
    )
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == 4672

    ds = gdal.Warp("", "../gcore/data/byte.tif", format="MEM", srcBands=[1, 1])
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == 4672
    assert ds.GetRasterBand(2).Checksum() == 4672

    # Error: len(dstBands) != len(srcBands)
    with gdaltest.error_handler():
        with pytest.raises(Exception):
            assert (
                gdal.Warp(
                    "",
                    "../gcore/data/byte.tif",
                    format="MEM",
                    srcBands=[1, 1],
                    dstBands=[1],
                )
                is None
            )

    # Invalid srcBands[0] value
    with pytest.raises(Exception):
        gdal.Warp("", "../gcore/data/byte.tif", format="MEM", srcBands=[2])

    # Invalid dstBands[0] value
    with pytest.raises(Exception):
        gdal.Warp(
            "", "../gcore/data/byte.tif", format="MEM", srcBands=[1], dstBands=[2]
        )

    # Test with RGB input dataset
    src_ds = gdal.Open("../gcore/data/rgbsmall.tif")
    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[1])
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(1).Checksum()

    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[2])
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(2).Checksum()

    ds = gdal.Warp(
        "", src_ds, format="MEM", setColorInterpretation=True, srcBands=[2, 1]
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert (
        ds.GetRasterBand(1).GetColorInterpretation()
        == src_ds.GetRasterBand(2).GetColorInterpretation()
    )
    assert ds.GetRasterBand(2).Checksum() == src_ds.GetRasterBand(1).Checksum()

    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[3, 2, 1])
    assert ds.RasterCount == 3
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(3).Checksum()
    assert ds.GetRasterBand(2).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(3).Checksum() == src_ds.GetRasterBand(1).Checksum()

    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[1, 2, 3], dstBands=[3, 2, 1])
    assert ds.RasterCount == 3
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(3).Checksum()
    assert ds.GetRasterBand(2).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(3).Checksum() == src_ds.GetRasterBand(1).Checksum()

    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[1, 2, 3])
    assert ds.RasterCount == 3
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(1).Checksum()
    assert ds.GetRasterBand(2).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(3).Checksum() == src_ds.GetRasterBand(3).Checksum()

    ds = gdal.Warp("", src_ds, format="MEM", srcBands=[1, 2, 3, 1])
    assert ds.RasterCount == 4
    assert ds.GetRasterBand(1).Checksum() == src_ds.GetRasterBand(1).Checksum()
    assert ds.GetRasterBand(2).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(3).Checksum() == src_ds.GetRasterBand(3).Checksum()
    assert ds.GetRasterBand(4).Checksum() == src_ds.GetRasterBand(1).Checksum()

    # Warp into existing dataset
    ds.GetRasterBand(1).Fill(0)
    ds.GetRasterBand(2).Fill(0)
    ds.GetRasterBand(3).Fill(0)
    ds.GetRasterBand(4).Fill(0)
    assert gdal.Warp(ds, src_ds, srcBands=[2], dstBands=[3])
    assert ds.GetRasterBand(1).Checksum() == 0
    assert ds.GetRasterBand(2).Checksum() == 0
    assert ds.GetRasterBand(3).Checksum() == src_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(4).Checksum() == 0

    # Test with RGBA input dataset
    src_ds = gdal.Open("../gcore/data/stefan_full_rgba.tif")
    ref_ds = gdal.Warp(
        "", src_ds, format="MEM", transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"]
    )

    # No srcAlpha nor dstAlpha ==> set implicitly
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"],
        srcBands=[2],
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == ref_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(2).Checksum() == ref_ds.GetRasterBand(4).Checksum()
    assert ds.GetRasterBand(2).GetColorInterpretation() == gdal.GCI_AlphaBand

    # srcAlpha=True
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"],
        srcBands=[2],
        srcAlpha=True,
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == ref_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(2).Checksum() == ref_ds.GetRasterBand(4).Checksum()
    assert ds.GetRasterBand(2).GetColorInterpretation() == gdal.GCI_AlphaBand

    # dstAlpha=True
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"],
        srcBands=[2],
        dstAlpha=True,
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == ref_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(2).Checksum() == ref_ds.GetRasterBand(4).Checksum()
    assert ds.GetRasterBand(2).GetColorInterpretation() == gdal.GCI_AlphaBand

    # Disable alpha
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"],
        srcAlpha=False,
        srcBands=[2],
    )
    assert ds.RasterCount == 1
    assert ds.GetRasterBand(1).Checksum() == ref_ds.GetRasterBand(2).Checksum()

    # srcAlpha=False, dstAlpha=True
    ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        transformerOptions=["SRC_METHOD=NO_GEOTRANSFORM"],
        srcBands=[2],
        srcAlpha=False,
        dstAlpha=True,
    )
    assert ds.RasterCount == 2
    assert ds.GetRasterBand(1).Checksum() == ref_ds.GetRasterBand(2).Checksum()
    assert ds.GetRasterBand(2).Checksum() != 0
    assert ds.GetRasterBand(2).Checksum() != ref_ds.GetRasterBand(4).Checksum()
    assert ds.GetRasterBand(2).GetColorInterpretation() == gdal.GCI_AlphaBand


###############################################################################


def test_gdalwarp_lib_preserve_non_square_pixels_if_no_reprojection():

    src_ds = gdal.Translate("", "../gcore/data/byte.tif", options="-f MEM -tr 60 30")
    out_ds = gdal.Warp("", src_ds, format="MEM")
    assert out_ds.RasterXSize == src_ds.RasterXSize
    assert out_ds.RasterYSize == src_ds.RasterYSize
    assert out_ds.GetGeoTransform() == src_ds.GetGeoTransform()

    out_ds = gdal.Warp(
        "",
        src_ds,
        format="MEM",
        outputBounds=[440720.000, 3750120.000, 441920.000, 3751320.000],
    )
    assert out_ds.RasterXSize == src_ds.RasterXSize
    assert out_ds.RasterYSize == src_ds.RasterYSize
    assert out_ds.GetGeoTransform() == src_ds.GetGeoTransform()


###############################################################################


@pytest.mark.require_proj(6, 3)
def test_gdalwarp_lib_preserve_non_square_pixels_same_horizontal_crs():

    src_ds = gdal.GetDriverByName("MEM").Create("", 20, 10)
    srs = osr.SpatialReference()
    srs.SetFromUserInput("EPSG:4326+3855")
    src_ds.SetSpatialRef(srs)
    src_ds.SetGeoTransform([2, 0.1, 0, 49, 0, -0.2])
    out_ds = gdal.Warp("", src_ds, options="-f MEM -t_srs EPSG:4979")
    assert out_ds.RasterXSize == src_ds.RasterXSize
    assert out_ds.RasterYSize == src_ds.RasterYSize
    assert out_ds.GetGeoTransform() == src_ds.GetGeoTransform()


###############################################################################


def test_gdalwarp_lib_preserve_non_square_pixels_if_no_reprojection_multi_sources():

    src_ds = gdal.Translate("", "../gcore/data/byte.tif", options="-f MEM -tr 60 30")
    left_ds = gdal.Translate("", src_ds, options="-f MEM -srcwin 0 0 10 40")
    right_ds = gdal.Translate("", src_ds, options="-f MEM -srcwin 10 0 10 40")
    out_ds = gdal.Warp("", [left_ds, right_ds], format="MEM")
    assert out_ds.RasterXSize == src_ds.RasterXSize
    assert out_ds.RasterYSize == src_ds.RasterYSize
    assert out_ds.GetGeoTransform() == src_ds.GetGeoTransform()

    out_ds = gdal.Warp(
        "",
        [left_ds, right_ds],
        format="MEM",
        outputBounds=[440720.000, 3750120.000, 441920.000, 3751320.000],
    )
    assert out_ds.RasterXSize == src_ds.RasterXSize
    assert out_ds.RasterYSize == src_ds.RasterYSize
    assert out_ds.GetGeoTransform() == src_ds.GetGeoTransform()


###############################################################################


def test_gdalwarp_lib_tr_square():

    src_ds = gdal.Translate("", "../gcore/data/byte.tif", options="-f MEM -tr 60 30")
    out_ds = gdal.Warp("", src_ds, options="-f MEM -tr square")
    gt = out_ds.GetGeoTransform()
    assert gt[1] == abs(gt[5])


###############################################################################
# Test proper computation of working data type


def test_gdalwarp_lib_working_data_type_with_source_dataset_of_different_types():

    int16_ds = gdal.GetDriverByName("MEM").Create("", 1, 1, 1, gdal.GDT_Int16)
    int16_ds.GetRasterBand(1).Fill(1)
    int16_ds.SetGeoTransform([2, 1, 0, 49, 0, -1])

    float32_ds = gdal.GetDriverByName("MEM").Create("", 1, 1, 1, gdal.GDT_Float32)
    nd_value = struct.unpack("f", struct.pack("f", -3.4028235e38))[0]
    float32_ds.GetRasterBand(1).Fill(nd_value)
    float32_ds.GetRasterBand(1).SetNoDataValue(nd_value)
    float32_ds.SetGeoTransform([2, 1, 0, 49, 0, -1])

    out_ds = gdal.Warp("", [int16_ds, float32_ds], options="-f MEM -dstnodata -32768")
    minval, maxval = out_ds.GetRasterBand(1).ComputeRasterMinMax()
    assert minval == 1
    assert maxval == 1

    out_ds = gdal.Warp("", [float32_ds, int16_ds], options="-f MEM -dstnodata -32768")
    minval, maxval = out_ds.GetRasterBand(1).ComputeRasterMinMax()
    assert minval == 1
    assert maxval == 1


###############################################################################
# Cleanup


def test_gdalwarp_lib_cleanup():

    # We don't clean up when run in debug mode.
    if gdal.GetConfigOption("CPL_DEBUG", "OFF") == "ON":
        return

    for i in range(2):
        try:
            os.remove("tmp/testgdalwarp" + str(i + 1) + ".tif")
        except OSError:
            pass
    try:
        os.remove("tmp/testgdalwarp_gcp.tif")
    except OSError:
        pass
